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

Paris' linguistic guide to the international language of, yes, love.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

How did a French journalist’s grave become the sexiest statue in the cemetery?

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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.

An off-the-beaten path cave with an underground lake.

An underwater statue of Christ blesses the depths off Key Largo.

A huge musical instrument played by the ocean.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.

Low tide reveals 8,000-year-old rock carvings in Southern Alaska.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

One of the most unusual geological features, recognizable from a dozen hit movies.

A Cold War site complete with rusty structures, hiking trails, and beautiful views.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Roaming bison and a spectacular view at the highest point in Nebraska.