Once a major stop on the Hejaz Railway, this desert station (complete with steam locomotive) has been abandoned for decades.

Lions carved into the rockface adorn these two tombs built into the mountains of Dadan.

An annual two-week festival near the city of Riyadh when Saudis let their hair down.

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.

This giant volcanic crater holds its very own field of salt.

Village of slate houses, built on a white marble outcrop.

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This elegant arc of a waterfall marks a religious turning point.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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).

The world's first ice hotel is still one of the most elaborate and beautiful.

This hulking behemoth is actually five interconnected towers built in the 1960s.

A battle between nature and architecture in the Cambodian jungle.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

Bangkok's men with dangerous jobs come here in search of protective talismans.

An enormous dragon scales the walls of this 17-story temple.

A shrine built to combat the bad karma of a commercial venture.

An enormous Buddha peers through a gap in its ruined chamber.

This Khmer-era temple includes a lintel that was stolen and displayed at the Art Institute of Chicago for years before returning to Thailand.