An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The macabre paintings created by famous suicide proponent Jack Kevorkian, or "Dr. Death."

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

An original apothecary from 1792.

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

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

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

Home to items never before seen by the public.

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

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

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

Eighteen miniature death-scene dioramas.

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

An astounding collection of medical specimens, including bits of President Lincoln.

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

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

A wonderful collection of all things Oz is nestled in the heart of Kansas.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

A unique attraction and museum dedicated to exploring iconic roadside structures.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

The oldest university museum west of the Mississippi retains its 19th century feel.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A medical facility that has been kept frozen in time.