Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

At 207 feet, one of the world's longest continuous escalators.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Home to items never before seen by the public.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.