The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The astonishing collection of an infamous criminologist.

This gravesite in the Amazon Rainforest was left behind by a failed Third Reich expedition.

World's oldest operating science fiction and fantasy club, once home to Ray Bradbury and L. Ron Hubbard.

Celebrating the accomplishments of Black firefighters in Los Angeles.

A Hawaiian stairway to heaven—that you can't climb.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

A tunnel of hardened lava along Maui’s famous Road to Hana.

Once home to over 8,000 exiled Hawaiians suffering from Hansen's Disease.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A science teacher's dream.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

The largest self-built castle in the U.S., six decades in the making.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.

A sacred lake with thousands of sacred carp and a biblical history.

A three-centuries-old crypt in the foothills of an old plantation.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

A former plague hospital turned medical museum.

One of the world's largest collections of pathological specimens.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.