A giant donut stands as a popular symbol of Los Angeles iconography.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A ghost town at the airport is now a refuge for blue butterflies.

The Mighty Wurlitzer organ continues to belt out the tunes at downtown El Segundo's historic home for silent and classic movies.

The sun acts as a key that only fits this giant keyhole twice a year.

Traditional 11th-century outdoor tannery.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

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

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

A Romanian church built from one single oak.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Gigantic Romanian salt mines used to heal respiratory conditions.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Something's watching you.

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

This once-derelict building is now one of the most beautiful bookstores in the world.

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

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A small town Romanian cemetery filled with darkly humorous gravestones.

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

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

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

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.