A small flooded ghost town with a few scattered structures remaining.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

This geothermal hot spring hides beneath a slowly growing mineral dome.

A replica that won't float away.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Remnants of a storybook amusement park hidden behind a strip mall.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

A landscape decorated with enormous skull sculptures.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A huge cathedral single-handedly constructed by one eccentric monk.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

Stroll through a wonderland of stupendous moss-covered trees.

Extraordinary sculpture garden created by an eccentric English poet.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.