A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

Elevated freight railway turned wildly successful urban park.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

World's most expensive home.

A remote island settlement off the coast of Tanzania is a storied archaeological site with an ancient past.

The tower in this 1,000-year-old mud-brick village seems to vibrate for no apparent reason.

17th century mosque for Shah Abbas' harem.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

The palace of the King of Kings, burned by Alexander the Great.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

A dreamy mausoleum honors Persia's most famous poet.

One of the holiest Shi'i shrines in Iran honors the life and death of a learned noblewoman who became a saint.

Marked by the hand of the explorer Henry Morton Stanley.

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

Ancient structures used to make and preserve ice in the deserts of Persia.

Long before air conditioning, Persian architects found an ingenious way to cool off.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

These little castles each held thousands of pigeons.

This protected area in Lake Huron contains some of the world’s best-preserved shipwrecks.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.