This 11th-century structure is one of the oldest churches in Romania.

A Romanian church built from one single oak.

This bone-filled cave got its name after they found 140 bear skeletons inside.

This snug medieval lane is one of the narrowest streets in the world.

A muddy alien landscape that is home to rare species of exotic plants.

No one knows who built this strange cave of worship or exactly why.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This quiet park's strange sedimentary spires were named after Kodak's color film.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

Over 50 historic windmills whir away at this outdoor museum.

When you can afford only half a road, you build only half a road.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

Standing at 21-feet tall, this space cowboy adds to the legacy of Route 66's muffler men.

The modest childhood home where the baseball legend and Yankees star learned to hit from both sides of the plate.

This unusually circular centenarian barn became a Route 66 icon.

The most remote tree in the world is more than 170 miles from its nearest neighbor.