Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

Canyon walls shrouded in ferns.

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

This natural marble cave is one of only five national monuments in Oregon.

A rock outcropping left by a glacier that made itself useful throughout the centuries.

Monument on the spot where in 1778, Bathsheba Spooner had her husband Joshua killed and dumped down his own well.

One philanthropist's extensive collection of knick-knacks and curiosities is now a public museum of oddity.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

A mysterious collection of stones stand outside a small New England town.

A botanic garden full of trees twisted into fantastic shapes and positions.