A winding, cliffside stretch of road overlooking the Delaware River.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

The Hveragerði fissure runs through this unassuming shopping center.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

Once the largest gravity dam in the world.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Where condemned pirates met their grisly end at the gallows on the River Thames.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

"The country that ate itself."

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

Two massive boulders, rocking back and forth with the ebbing of the sea.

The narrow passages will challenge even the bravest driver.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.