Not a single witness can attest to the creation of the world's largest geoglyph.

When you get to Magnetic Hill park near the sign, put your vehicle in neutral gear, and watch it roll uphill...

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

A fifth-century temple improbably built into the side of a cliff.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

A son-and-daughter meat market, hawked by mom and dad.

An abandoned guano-mining city in the South Pacific.

An extraordinary collection of 18th century anatomical waxworks.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

An antique curios dealer and hybrid taxidermist.

Microscopic fossils suggest Australia may be the birthplace of sulphur-based life forms.

Peek through a transparent pyramid and drink in the mountain made of books.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Plagued by riots, celebrity injuries and a tragic death, this amusement park has been demolished.

This singular broken monument, now housed in a museum, was the cause of a worldwide "Mayan Doomsday" phenomenon.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

Obelisks and stone pineapples in the Irish countryside.

A corkscrew-shaped barn in Ireland.

The first island in the world designated a light-pollution-free astronomical observation point.

This extraordinary geological oddity resembles human-made pavement.

Known for the tunnel that leads visitors to the water.