A series of sculptures beneath the waves promote ocean conservation and support coral reefs.

After much poking and prodding, this island is decidedly not a magnetic anomaly, but it sure is pretty.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

This rickety old shed hides a trove of secondhand literary treasures.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A museum, walk-through diorama, and library nestled under one castle-like roof.

The lowest point in South Dakota and the source of the Minnesota River.

This sculpture gallery is home to magnificent beasts made of scrap metal and found objects.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

An entire city block built completely out of petrified wood.

This Wild West attraction is alive with glitching automatons.

A cemetery housing wild west legends in South Dakota.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

A fitting attraction for the corn capital of the world.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.