A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Designed to allow funerals to proceed over the River Dulnain.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

From grand battles to daily life, this Spanish museum offers a view of world history in miniature.

Get hands on with the technological marvels of the Classical world.

The first location of the eventual video game giant.

On Japan's Tashirojima Island, cats are king.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

The final resting place of the poets Shelley and Keats.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Often referred to as the largest spring in America.

Peer into this window for an interesting glimpse into the public utilities that make this city run.

These unique toilets feature transparent glass covered in PDLC film.

This sculpture presents commentary on a life in pursuit of profits.

A tree that defies gravity grows in an ancient ruin.

This 19th-century religious artwork was once highly controversial—because it was donated to the church by a divorcee.

An eclectic trailer park retreat in the middle of the California desert.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.