Housing the groundbreaking maps and globes of Gerard Mercator.

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

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

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

The highest point in Belgium is a staircase to nowhere.

A little sculpture with a large wardrobe.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

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

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

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

A spiritual vortex among the red rocks in Sedona.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

Op-art architecture designed for happiness.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

A surreal statue honoring Prague's favorite literary son.

Monument to a suicide protesting the Soviet invasion.

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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.