Stone Age solar temple is aligned with the sun on each equinox and solstice.

This subterranean necropolis holds three floors of antler-dug grave caves.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

The best-preserved Roman small town in North Africa.

Founded in 670, this ancient mosque is an architectural time portal.

A popular winter vacation destination for migrating monarch butterflies.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.

At high tide, the base of the lighthouse covers practically every inch of the island.

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

A hugely vast Irish landscape of barren rock that stretches for miles.

This elaborate towering structure was once famed for its revolutionary height.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

This artificial archipelago was supposed to resemble a map of the world.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."