The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

This medieval village clings to a cliff in southwestern France.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Spain's largest bullring offers a unique glimpse at architecture and history.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

Engineering ingenuity during the battle of Gibraltar.

Single runway interrupted by a busy road that cuts across its middle.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The largest known Ancient Egyptian obelisk.

This 7th-century monastery was sacked by Saladin.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

Rare surviving tombs from one of the "Dark Ages" of Ancient Egypt.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Gladiators once walked this ancient, subterranean passage.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A condom-covered Thai restaurant that is more concerned with birth control than food.

A historic freight system that found the true gold rush is in tourism.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.