A Victorian-style home known as the “Castle on the Hill.”

These five Art Deco homes were meant to solve the "small house problem."

Mysterious Spanish catacombs of unknown origins.

Unique antiquarian shop specializing in globes, maps, and prints.

This 46-foot-tall carving of a legendary Māori navigator can only be visited by boat.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

Press 1 for knock-knock jokes.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

Home of a 28-foot tall stalagmite known as the War Club.

West Virginia’s first state park commemorates one of the state’s last significant Civil War battles.

This lookout tower built in the 1930s is now an in-demand cabin with what might be the best view of the Seneca State Forest.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

In 1869, Swiss and German immigrants settled in this small town in the mountains of West Virginia.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

This university transit system is a 1970's vision of the future.

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

A unique marker erected during the 18th century.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

The library of every book lover's dreams.

Pluto is still considered a planet in Ithaca, New York.