This vast kitty-themed collection illustrates the history of human-cat interaction.

Art museum based around the collections accumulated over 58 years by one eccentric thrift store owner.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

A piece of outsider public art accompanied by a strange urban legend.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

A private museum dedicated to preserving the heritage of Mardi Gras' most beloved underdog parades, open by appointment.

The Grand Canyon of Texas.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

One man's fulfilled dream of living on an artificial island made of recycled plastic bottles.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

An acoustic anomaly with a mysterious cause.

Iran's colorful terraces are a rare geological masterpiece.

A miscalculation turns a very shallow freshwater lake into a very deep saltwater lake.

A Cajun-style Christmas on the river also involves sky-high pyres and explosives.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

A black and white solution to the Bolivian city's traffic problems.