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

The tallest hotel in Europe.

Moscow's imposing monument to the Space Age.

Former headquarters of the KGB.

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

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

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

This collection of solar timekeepers includes the world's first digital sundial.

A moving memorial to the fallen and missing from WWI trenches.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

Lavish royal estate punctuated with heated greenhouses.

Most prolific publishing house in the 1600s open to the public.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

This abandoned Belgian fortress is purposefully being left to nature.

A giant bug impaled on a 75-foot-tall needle.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.