A fifth-century temple improbably built into the side of a cliff.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

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

Ozymandias’ time-keeping temple.

One of America's most historic homes also holds a startling literary legacy.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Architectural monsters are devouring this palace's every door and window.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Last stop before the top of the highest peak in the world.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

California's oldest existing theater building hosted an impressive cast of celebrities, including hosting Mark Twain's first lecture.

The famous winding walk at Chartres is surrounded in mystery and myth.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A house carved into a rock in the 1940s.

Of course Salvador Dalí lived in a castle...

An eccentric inventor's castle home with its own indoor weather system.

A hand-built folk art installation covered with messages of God's love.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The curiosities and wonders of pharmacy in a delightful historic building.