Former headquarters of the KGB.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Northern Ireland's Brobdingnagian stepping stones.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

This unique building in the main square stands out among the city's typically Baroque architecture.

Dynastic Home of the De Piro Family.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This subterranean necropolis holds three floors of antler-dug grave caves.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

This micro-nation may be some sort of prank, but its constitution sure seems official.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

According to legend a man pooped out the window of this tower to prove that it was straight.

This famed marionette theater and museum is bursting with imaginative string puppets.

In this truly magical place, rent hasn't been raised since the year 1520.

World's largest barrel containing an inn.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Model Trains and Much More in Hamburg.