City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The longest and widest floating bridge in the world.

The first park built over a freeway is a brutalist masterwork.

This former coal gasification plant found a curious second life as a popular public park.

A museum dedicated to the history and exploration of both popular music and science fiction.

The most famous location in China was home to whole dynasties worth of imperial rulers.

This landmark cemetery in Boston was created more than 300 years ago.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

A castle that was built stone by stone by an eccentric journalist.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The legendary building that needed ghostly approval before being built.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

France's most famous cemetery, with some of its most curious tombs.

"The country that ate itself."

Megapodes incubate their eggs using the heat of an active volcano on this Pacific isle.