Where commuters walk through remnants of an ancient Greek necropolis.

Some of the smallest works of art in existence.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

A centuries-old forgotten underworld lies beneath Malta.

The eclectic seaside sanctuary caters to a rather fowl crowd.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Structure built from the skulls of vanquished foes.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A misnamed well, with a deep dark past.

The unusual sculptures are believed to be powerful political symbols.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Fascinating early attempt at a Jewish autonomous settlement.

This massive glowering Lenin head gazes out over eastern Siberia.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

Church built on the site where the last tsar of Russia and his family were killed.

Mostly underground in the old days Back in the USSR, today the Beatles beckon to tourists from a wall sculpture out in the open in central Russia.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

Russia's own leaning tower was built on a tragic historical fable.

This nostalgic Russian museum is full of USSR cultural artifacts from the 1970s and 80s.

Replica of mosque destroyed by Russia in the 16th century.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

Former headquarters of the KGB.

World's largest bell sits on the grounds of the Kremlin in Moscow.