Cizderiye (Tzistarakis) Mosque, Athens, Greece

Built in 1759 by the Ottoman governor of Athens, Mustafa Agha, desecrated by the newly independent Greek State after 1830s and used as a ballroom, barracks, prison and a storehouse.

For context: a List of Mosques in Athens (2 - both non-functioning, not including underground prayer rooms)

vs a partial List of mostly functional Churches in Istanbul (62) (PS: Google lists 203 locations as Churches in Istanbul in English search)

Fethiye Mosque, Athens, Greece

17th Century mosque replaced the one built/converted after the Ottoman conquest in 1450s. After 1824 it's minaret was torn down and used as barracks, a military prison and finally as a military bakery. Recently restored for profane use.

Mosque of Ibrahim Pasha of Parga
(Church of Saint Nikolas) Kavala GR

Built ca.1530 in the name of the Grand Vizier to Sultan Suleyman the Magnificent, converted to a church in 1926 after its minaret was destroyed and a bell tower added.

Chios (Sakız Adası) Mecidiye Mosque

Built during reign of Sultan Abdülmecid (1823-1861), the island's only mosque was recently "restored" and converted to a Byzantine Iconography Museum (b&w anon, ca.1900)

Halil Bey Mosque (Old Music)
former Ottoman Sanjak of Kavala

Was a 16th Century mosque and madrasa. After it's desecration it was used as a school, concert hall (hence the nickname) and today serves as a "Cultural Center"

Kavala Imaret (almshouse / public kitchen)

One of Greece’s most important Ottoman monuments, it was built in 1817 by Mohamed Ali of Egypt, who was from Kavala himself. Today it is a luxury **HOTEL**

Saatli Mosque, Selanik (Thessaloniki) Greece

An 18th Century Ottoman mosque built by Selim Paşa. It was burned down, together with much of the Turkish and Jewis quarter of Salonika, in August 1917

Yeni Cami (Hamidiye Mosque)
Selanik (now Thessaloniki, Greece)

Built in 1902 as the last mosque of the Turkish city of Selanik, it was desecrated, minaret torn down and now used as an exhibition hall by the invading Greeks

Alaca İmaret Mosque, Selanik (Thessaloniki)

Built in 1484 by İshak Paşa, Grand Vizier to Sultan Mehmet the Conqueror. Named after it's multicolor minaret which was torn down after 1912, it is now used as a public building by the occupation municipality.

Osmaniye Mosque, Sakız (Chios)

Built in 1892 to serve the once-vibrant Muslim community of Chios, which has since been massacred or expelled by the Greeks. "Restored" mosque is not open to visitors or worshippers, only used for exhibitions.

engrving Jean-Baptiste Hilaire, 1782

Osman Shah Mosque (Tırhala)

Designed ca.1550 by Ottoman imperial architect Sinan and the only mosque still standing in the city of Trikala out of the at least eight reported by Evliya Çelebi. No longer used for worship as per cultural genocide policies of the greek state.

Ottoman Vezir Mosque (Kandiye)

Built circa 1856 in Heraklion, Ottoman Crete. Converted to a Church dedicated to St. Titus after the the genocide of Cretan Muslims.

Recep Paşa Mosque, Rhodes (Rodos)

Built in 1588 by Grand Vizier Recep Pasha, it somehow survived the destruction of most mosques on the Island by Greeks, and now is in a partially collapsed state

Yeni Cami (New Mosque) Vodina (today Edessa, Greece)

An older mosque restored in late-19th Century, closed to worship after city was ethnically cleansed of Muslims and Macedonians in 1912. Today it is a barn with graffiti covered walls.

Hanya Hünkar Mosque, Girit
(Church of St. Nicolas) Chania GR

Built on top of a former Venetian Catholic monastery, mosque became part of ethnically cleansed greek Crete and converted to an Orthodox church with the addition of a bell tower

Hamza Bey Mosque (Alkazar Cinema) Thessaloniki, occupied Selanik

15th Century Ottoman mosque mamed after the Beylerbeyi of Rumeli and built by order of Hafsa Hatun. Sold to private owners and used as a cinema for decades. Now under a never-ending "restoration"

Faik Paşa Mosque, Narda (Arta)

15th Century mosque by Faik Paşa, a vizier of Sultan Mehmed II the Conqueror, who was probably from the area as his tomb is nearby. Destroyed by Greeks after the area was occupied by them in 1881, now awaiting "restoration"

Tomb of Hacı Osman Paşa, Hanya (Chania) Crete

Like all Muslim cemeteries on the island, this tomb of an Ottoman governor was desecrated by Orthodox Greeks after the genocide of Cretan Muslims. Today it serves as a RESTAURANT

Küçük Hasan Pasha Mosque, Hanya (Chania) Crete

Also known as Yalı or Janissaries' Mosque, built circa 1650. This beautiful sample of islamic art lost its minaret after the genocide of Cretan Muslims and now is used as an exhibition hall

Yeni Cami Mosque, Yenişehir (Larissa)

Mid-19th century mosque escaped destruction but lost all function. Served as an archeology museum for many years and is now a cultural center for non-existing greek culture #DiscoverGreece

Sultan Mustafa Mosque, Rodos (Rhodes)

Part of a complex that includes a Turkish Bath, the partially destroyed mosque built by Sultan Mustafa III. in 1765 is now used as a wedding hall by the small Turkish Muslim population of the island

İç Kale Mosque, Anabolu (Nauplia)
The Catholic Church of Metamorphosis

One of many desecrated Ottoman structures in the old Greek capital of Nafplio. Converted to a Catholic church in 1839

Old Tzami Mosque, Anabolu (Nauplia)
Trianon Theatre, Nafplio

An early Ottoman mosque, first coverted to a church after the Venetian occupation in 1687. During the 20th century it operated as a cinema and today, like rest of Greece, it is a theatre

Ağa Camisi, Anabolu (Nauplia)
Vouleftikon, People's Assembly

Built circa 1730s, this is the 3rd converted mosque in the old Greek capital of Nafplio. Served as the first Hellenic Parliament, today it is a conference center

Kavaklı Mescidi, Rodos
St Spyridon Church, Rhodes

only 100 meters away from the wedding hall that was once the Mosque of Sultan Mustafa lies this little mosque converted to an Orthodox chruch by the Greeks (thanks @mimarimiras)

Sultan Murad III. Mosque, Navarin
Hagia Sotira Church, Neokastro, Pylos

16th century mosque within the New Castle; converted to a church after Navarino surrendered to the greeks in 1821 & 3000 Turks were all massacred despite promise of safe passage

Lesbos (Midilli Adası) Valide Mosque

Built in 1615 in the Turkish quarter of Mytilene, it was left to rot after the island's Turkish population was wiped out. Supposedly a restoration started in 2018 but now suspended.

Lesbos (Midilli Adası) Yeni Cami
Yeni Tzami Mosque, Mytilene

Commissioned by Gov. Kulaksızzade Mustafa Ağa circa 1825, it is in a rotting state as per the cultural genocide policy of the greek state. 3rd pic a birdhouse, 4th pic is the Medrese in the courtyard

Feyzullah Mosque, Narda (Arta)

A small and classical Ottoman mosque, minaret destroyed after the Greek occupation in 1881. Now in a decaying state and used as a house

The Old Mosque (Cami-i Atik) Serez

Oldest mosque in Turkish town of Serres, dated 1385 and Grand Vizier Çandarlı Halil as its benefactor. Coverted to a church during Bulgarian occupation, torn down by Greeks in 1938

Clock Tower in 2nd pic destroyed by Bulgarians in 1913

Mehmed Bey Mosque, Serez

This late-15th Century mosque is the largest and oldest surviving former mosque of Serres. Suffered extensive damage as the city was cleansed off Muslims, today the building is derelict and unused.

Zincirli (Selçuk Sultan) Mosque, Serez

16th Century mosque of Mimar Sinan école, it is somewhat in better shape then the other surviving mosques of Ottoman Serres, recently restored to serve as an exhibition center

Zincirli (Selçuk Sultan) Mosque, Serez (Serres), Northern Greece (II)

Mustafa Bey Mosque, Serez

Built during the 2nd half of 15th Century, this mosque is attributed to 16th century Grand Vizier Koca Mustafa Paşa in some online sources, but i believe that's wrong.

It was misused as a carpentry shop for many years and now is in a derelict state

Bedesten of Çandarlı Ibrahim, Serez
Archaeological Museum of Serres

Built by Çandarlı Ibrahim Paşa II. circa 1494. Today used as an archaeological museum, of course without any traces of the Ottoman period.

The Old Medrese of Athens

Early-18th century Ottoman school that was destroyed in early-20th century. Located near the Roman Agora, its portal is all that remains standing

Emirzade Mosque, Eğriboz (Chalcis/Chalkida)

The only surviving mosque of the once vibrant majority-Turkish town of Khalkis. After the local population was wiped out in 1831, the mosque somehow survived and is now an archeology museum annex #Greece200years

Çelebi Sultan Mehmet Mosque, Dimetoka
The Great Mosque of Didymoteicho

The oldest mosque in Europe, dating back to late 14th Century, was burned down in March 2017 while it was supposedly under restoration

Bayezid (Atik) Mosque, Drama
Church of Agios Nikolaos

Built during reign of Beyazit II. and restored during Hamidian era, desecrated by both Bulgarians and Greeks and since used as an Orthodox church with the addition of 2 hideous bell towers

Gazi Evrenos Bey (Evrensoglu Iskender) Mosque, Yenice-i Vardar

Named after the patriarch of the legendary Ottoman raider family of Evrenos, the mosque is now in a ruined state, like many other Ottoman heritage sites of Turkish Yanniça (Giannitsa)

Evrenosoğlu Şemseddin Ahmed Bey Mosque, Yenice-i Vardar (Giannitsa)

This small mosque built by the grandson of Gazi Evrenos Bey, circa 1500, is in ruins today

Evrenosoğlu Şerif Ahmed Bey Clock Tower, Yenice-i Vardar (Giannitsa)

Another Ottoman landmark left by the Evrenos dynasty. Long neglected by the Greeks and only recently restored. Mosque and Muslim cemetery in 3rd pic long gone.