A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

A sharp bend in a dramatic river canyon cut through red rocks.

A superb spot to appreciate the traditional boats of the Indian Ocean.

Robot jockeys ride their humped mounts to victory as part of a 21st-century twist on an ancient desert sport.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

Eighty million natural history specimens call this gargantuan museum home.

Something's watching you.

A medieval church built up to defend its village.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

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

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

A giant portrait of an ancient king looms over the river.

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

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

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

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

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

This enormous abandoned prison was once dubbed the "Bastille of Romania."