Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A once-fairy tale mansion now stands in a state of disrepair.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A Nesting Doll of Churches.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A Hungarian optometrist's charming collection of Asian art and curiosities.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

Once the home of a hermetic monk, this cave now houses a small church.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A former suicide bridge is now accumulating symbols of love instead of a body count.

It houses the remains of a 17th-century version of the Titanic.

This small museum is basically a time capsule of daily life in the Soviet Union.

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

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

A fountain standing as a testament to a doomed alliance.

Large miniature theme park with 100-plus models.

Step back in time and witness the fall of Constantinople.