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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A museum of carnival attractions where you are invited to ride the rides.

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

This massive library holds what was once the largest book collection in the world.

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

This repurposed church offers a more literal way to get closer to the heavens.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

Burbling away in refrigerators are 105 sourdough starters from around the world.

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

Burping, gurgling geothermal mud pots by the Salton Sea.

North America's largest accredited model railroad museum.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The dramatic upward-curving roof is one of the most iconic examples of Googie architecture that still stands today.

Decommissioned experimental solar facilities that pioneered solar energy technology.

Hidden among the multi-million dollar mansions in the Santa Cruz hills is a sanctuary for troubled birds.

This historic tower in the California desert promises visitors a "vortex of good vibes".

A deserted hodgepodge of experimental structures designed by nearby university students.

A popular winter vacation destination for migrating monarch butterflies.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

Over 315,000 preserved amphibians and reptiles in jars.

The quiet canyon has a tumultuous history involving a doomsday cult.

Abandoned anti-ballistic missile base.