A self-built castle made by a mysterious man.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Former meatpacking facility turned vertical farm and sustainable business complex.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

This South London cemetery holds the remains of more than 15,000 people.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.