These mansions date back to Chicago's days as a brewer's paradise.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Strange physical sensations and optical contradictions keep visitors coming back for more.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Peek through the gates at this oasis from the city, full of Old English charm.

The largest stone moai on Rapa Nui.

Rippling sand dunes frozen in the Arizona rock.

Unique geological formations in China, featuring some suggestive shapes.

A toxic ghost town sitting atop a massive coal fire.

A church of bones, decorated with 40,000 human skeletons.

A 16th-century horror show built in a lovely Italian garden.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

The world's brightest bioluminescent bay.

A modern zoetrope on the New York City subway.

This innocent-looking townhome is actually a subway exit.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Ride the subways of yesteryear.