Eccentric concrete mansion and museum designed and built by hand from the inside out.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

In the early 1800s, surgery was also a show.

World's first "penitentiary," meant to be humane, drove men insane.

Arlington Cemetery exhibit dedicated to death and grieving.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Outsider art meets paleontology at this roadside reptile repository.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

This might just be the TARDIS of bookstores.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A Civil War Museum with some notable medical antiques.

The Home and murder site of the witch of Rehmeyers Hollow.

This abandoned sea fort has become an accidental bird sanctuary.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A museum dedicated to exhibiting remarkable outsider art.

Walk through the history of American pop culture.

Eighteen miniature death-scene dioramas.

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