A complex of six forts embedded in the Rajasthan hills.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

A nearly unconquerable island-fort in the Indian Ocean.

A centuries-old fortress city lies in ruin.

This hilltop warren of monastic dwellings is the result of centuries worth of Mongol attacks.

An eclectic mix of influences rot together in harmony in this India necropolis.

Modest by day, illuminated majestically at sunset.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

A blooming house of worship for the masses.

The world's second-largest sundial, made entirely out of stone.

Centuries-old bridges grown from tangled roots.

Home of modern dancer famously strangled by her own scarf.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Visible below the waves are memorials to the city's Gold Rush dead.

Olfactory delights in San Francisco's Botanical Gardens.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A winding path built in secret on the edge of the continent.