A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

What started as a tailor shop to help swimmers live their mermaid dreams has grown into a full-scale aquarium, complete with live mermaid shows.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Flip your own pancakes in this old sugar mill within a Florida state park.

Electrical pylon in the shape of Disney's beloved mouse.

The culprit who accidentally lit this 3,500-year-old tree on fire stated "I can't believe I burned down a tree older than Jesus."

A vast array of tropical plants collected by a vacationing couple.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This set of rickety spaceships are prepared to give alien travelers a place to relax and go to the bathroom.