The headquarters in Salem doubles as an occult art gallery.

There's a crumbling old mansion inside the Smithsonian National Zoo.

A perfect replica of the beloved show's first set.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

One man's quest to fix his toilet unearthed over 5,000 artifacts spanning more than 2,000 years of history.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A mud brick kasbah with a history of lavishness and traitorship.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A treasure trove of rare and fine fabrics from around the world.

The largest retailer of seashells in the world.

Dig for your own trilobites in this goldmine of invertebrates.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.