A church of bones, decorated with 40,000 human skeletons.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A museum of magic with a Sadist past.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

The deepest metro station in the world.

340-foot statue built to honour the Heroes of the Soviet Union.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.

This unique Lady Liberty is one of the only examples of the figure sitting down.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

These Stalin-era industrial 'death traps' hang lifeless above the city

A surreal statue honoring Prague's favorite literary son.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Two stunning 17th-century libraries and a cabinet of curiosities.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.