The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This Australian beach is composed of tiny shells.

Aqua white sand highlighted with fiery red rocks.

A collection of full-size movie monsters opened to the public.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The headquarters in Salem doubles as an occult art gallery.

An eccentric inventor's castle home with its own indoor weather system.

The macabre graffiti spectacle in a quarry in a Massachusetts forest reservation.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

Carved, egg-shaped stone with no explanation.

Antique gaffe kept in the basement of a small Vermont natural history museum.

This sandstone gorge in New York State's Adirondack Mountains is home to waterfalls, flumes, and more.

Nature and religion are reunited at this unconventional church in the forest.

The New England cabin where an infamous British occultist conducted experiments in "magick".

The 100-year-old public collection of a New Hampshire dentist that contains taxidermy, Native American artifacts, and a pair of mummy hands.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The remains of a deserted 1800s farming community can be found in Little River State Park.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

An abandoned town centered around a paper mill powered by a large waterfall.

Explore the dark underground corridors of this graffiti-covered former military fortification.

A very big rock just plopped down in the New England woods.

Even Henry David Thoreau found this glacial pothole irresistible.