A preserved block of timber buildings from the city's industrial era in the Middle Ages.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

An art deco ice cream shop covered in vintage train station tiles.

Two islands just 4 km apart separated by an International Border and Date Line.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

The final resting place of the world's first nuclear reactor.

360° views of the city plus five floors of optical illusions and hands-on science.

All that's left of the quintessential "cabin in the woods."

The largest of London's subterranean rivers and once a mad, bad center of London life.

A special train service transported Sydney's dead from this station to "Necropolis Receiving Houses" at Rookwood Cemetery.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

An intricately carved Viking church overlooks a glistening fjord.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

This peculiar museum offers hands-on interaction with seemingly intangible principles of mathematics.

An elevator into the Baltic Sea.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Four-story concrete hotel never opened to customers.

Destructive children, start your engines.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

This single room has survived the centuries with almost no deterioration.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.