Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

A museum dedicated to man's boldest venture.

A small car graveyard sits in the shadow of the famous Cadillac Ranch.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

Art museum based around the collections accumulated over 58 years by one eccentric thrift store owner.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Largest lake in Great Britain measured by surface area.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The most loyal of little dogs, or a Victorian era publicity stunt?

A sweet symbol marks the place where torturous executions were once carried out.