The building features one of the last remaining free-floating spiral grand staircases in the U.S.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This popular pitstop lives up to its name.

The world's largest underwater restaurant is submerged off the southern tip of Norway.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

This spectacular track has run continuously since 1882.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

A gargantuan crystal kingdom.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

This ancient goddess temple inspired the design of India’s Parliament House.