A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This massive library holds what was once the largest book collection in the world.

Weird wax anatomical models reside here, as do other anatomical specimens.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

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

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

A small Portuguese cottage formed between boulders in the countryside.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

The corpse bride of Portugal.

Pagan monument converted to Christianity with the population.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

The remains of a deserted 1800s farming community can be found in Little River State Park.

Rock-cut cave complex filled with ancient Buddhist artwork.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.