A modern-day Lascaux cave underneath Paris.

Abandoned railway line circling the city of Paris.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

Marvel at the opulent Art Nouveau interior while dining on dirt-cheap French classics.

Shop at the 200-year-old store where Julia Child stocked up on copper cookware.

Order a boozy baba au rhum at the oldest patisserie in Paris.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

Thousands of mounted insects, and some live ones, hide within an otherwise ordinary shopping mall.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

Community owned and operated, this property is home to a diverse set of nudists.

An abandoned sawmill from more than 134 years ago stands testament to the ambition of one man.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

A historic freight system that found the true gold rush is in tourism.

Impressive artifacts from Juneau's gold mining days fill this mining site-turned-museum.

This shrine to the patron saint of Alaska sits on a small tidal island and was built from the land’s own beach stones.

The ruins of this Alaska gold mine form a gorgeous ghost town.