A bizarre house filled with an astounding array of collections.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

These curious caverns have been home to mushrooms, gangsters, and disco.

A museum within a museum, devoted to history's most questionable medical devices.

Admire the art and then buy a raccoon skull cleaned by flesh-eating beetles.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

Thousands of majestic trumpeter swans fill this park, sounding distinctly like a certain brass instrument.

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.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

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

An original apothecary from 1792.

The narrowest house in America is seven feet of pure spite.

The national park was once a plantation estate.

The site of the climactic scene from the classic horror film is now a historic landmark.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Home to items never before seen by the public.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

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