Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

The largest known Ancient Egyptian obelisk.

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

The octagonal tower at this important Buddhist site was added many years after the temple's initial construction.

A bulky, ancient stupa marks the site of Siddhartha Gautama's seminal Buddhist teaching.

A Zoroastrian funerary tower where excarnation rituals are carried out is threatened by the area's dwindling vulture population.

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

A startling, centuries-old subterranean marvel hides in plain sight.

A blooming house of worship for the masses.