Two geoglyphs that are truly unique to North America.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

A network of ancient tunnels and vaulted chambers with mystical Buddhist reliefs, built for ascetic training.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

The arching stretch of London's longest street holds many reminders of the area's maritime past.

The first skyscraper to include a Ferris wheel built into the facade.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

Established over a thousand years ago, this family-run teahouse continues to serve skewers of sweet rice cake to this day.

The oldest vestiges of Madrid found here, have been incorporated into this new museum.

One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.

This supermarket offers shoppers a window into the past alongside their groceries.

An abandoned castle owned and ignored by Masons carries a cursed history.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

The poet Walt Whitman was a frequent visitor to this spot, the highest on Long Island.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The remnants of this unusual bridge await an uncertain fate.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Hidden behind an industrial area, this is one of the very few such transporter bridges in existence.

A plaque installed underwater marks the fall of a royal family from an imagined parallel universe—part of a globe-spanning art project.

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.