Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

The celebrated eyesore created by starry-eyed sweethearts.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This bridge was constructed from the rubble of the infamous Bastille.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A miniature city, once ruled by the Queen of the Netherlands.

Some of the world's only freshwater seals live in one very special lake in Russia.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

Breathtaking and huge 430 year old maps of Italy.

Old Danish castle immortalized in Shakespeare's Hamlet.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

One of the most controversial statues in Romania is an emperor with no clothes.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

The bears of Bern have been a city highlight for over 500 years.

Elaborate mansions built by Roma residents in Soroca to show their success after centuries of discrimination.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.