Floating swimming pool within a moored vessel.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A collection of colorful dinosaurs hidden in an actual rainforest.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A tunnel of hardened lava along Maui’s famous Road to Hana.

20,000 pieces in a Frank Gehry-designed building.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Colorful and chaotic stacked hotel in North Holland.

Home to three historic ships from the age of Vikings.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A promotional sun clock on the site of San Francisco's great raceway.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A white oak with property rights.

What is the Thing?

66,000 pieces of art, donated by one of the world's richest men.

Deep scars on the earth left by the Ice Age.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The site of a tragic massacre that spawned a multimedia franchise.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.