The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

Did Gustav Eiffel design this enigmatic metal building?

Giant topiary dog once played a role in a terrorist bomb plot.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

An ancient capital city that dates back 3,000 years and harbors many surprises.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

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

The footprint of a frustrated devil in Munich's Cathedral.

A museum now occupies the mansion in Samoa where the prolific Scottish writer chose to spend the last years of his life.

Ancient mysterious ruts carved in the bedrock.

This Stone Age solar temple aligns 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.