This free, take-a-book shop seems like a trick but isn't.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

This abandoned sea fort has become an accidental bird sanctuary.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Walk through the history of American pop culture.

Eighteen miniature death-scene dioramas.

Remnants of a storybook amusement park hidden behind a strip mall.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

An original apothecary from 1792.

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

A historic arena where the Beatles played their first concert in the U.S.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Tiny observatory made big contributions to the study of the Earth's motion.