While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

A little-known hot spring haven right below the highway.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The only surviving piece of Copenhagen's 16th-century defensive wall.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

An abandoned swimming pool decays on the outskirts of Berlin.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

This curious sculpture represents the perseverance needed to take to the skies.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

When German-Iraqi relations broke down, this embassy was vacated post haste.

This watchtower once presided over the Berlin Wall.