An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Yo, Adrian!

An abandoned stretch of highway, deteriorating next to the operational one.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The ghostly remains of an accidental sea.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The celebrated eyesore created by starry-eyed sweethearts.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

San Francisco's newly reopened hands-on science museum.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of a space program monolith.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A world-class observatory in the California desert.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.