One of seven Jewish catacombs in Rome and one of only two open to the public.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The final resting place of the poets Shelley and Keats.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

San Francisco's newly reopened hands-on science museum.

Olfactory delights in San Francisco's Botanical Gardens.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

The site of the climactic scene from the classic horror film is now a historic landmark.

A semi-scholarly approach to sex.

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

This shop specializes in oddities and Victorian-inspired wonders.

A winding path built in secret on the edge of the continent.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

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

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

An eccentric German artist built this weird and wondrous castle packed with shocking sculptures and alien art.

A sculpture serving as an homage to Pope John Paul II.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.