A trading post in the North Pole where children send letters.

A classic roadside attraction on Vermont's historic Route 5.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

This massive underground salt mine now holds a sci-fi theme park in its depths.

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

These abandoned huts still hold the remains of an early 20th century Australian researcher's work.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Possibly the world's only drive-in movie theater with an attached motel.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

Southern Ocean waters and glacial forces transform the Antarctic ice into these stunning bridges and caves.

This former quarry is now a picturesque gorge that hides a sunken lake.

This abandoned Antarctic base sits nearly unchanged since it was forsaken in the 1950s, just waiting for you to visit.

This concrete ship has had four careers - World War I tanker, floating amusement park, fishing pier, and artificial reef.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

No one is sure what to do with this WWII shipwreck that sits at the bottom of the Thames, still loaded with tons of explosives.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

Climb right into the heart of this colorful Iceland volcano.

Built in 1911, the Tees Transporter Bridge is one of only six transporter bridges still in operation.

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

Peek into the world of those creating the beautiful, delicate paper parasols found all over the globe.