Visit Shibam

A skyline of 2,500-year-old gingerbread tower houses with white gypsum trim, one of the oldest cities in the world.

Sunken Byzantine reservoir under Istanbul, its columns rising from black water.

Dramatic valley of mud-brick towns.

Island of alien dragon-blood trees.

Tombs of the pharaohs near Luxor.

Parthian desert city whose temples fused Greek, Roman and eastern styles.

Saudi Arabia's Nabataean rock tombs.

Sacred red monolith at the desert heart.