An alchemist's "magic door" stands in the middle of a Roman park.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The highest peak in the state of Vermont has some interesting features.

Once the center of food production for this small town.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

This backwater graveyard in the Hamptons became a trendy burial spot and posthumous status symbol for famous artists.

This black church sits alone among a field of lava rock.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The world-record holder for the longest bridge stretching continuously over water.

Roman ruins top white travertine terraces formed by ancient hot springs.

The Hanshin Expressway goes right through its 5th, 6th, and 7th floors.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Step inside an ancient beehive tomb built for a mysterious cult hero.

The hallucinogenic center of the ancient world.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

In Egypt's expanding metro area, many of the neighbors are dead.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

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