A cobblestone alley with an interesting past.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

A beautiful 62-acre Catholic shrine and botanical garden.

A strange house built only at night, with rumored mystic inspiration.

Towering basalt columns, a creation of fire and ice.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

360° views of the city plus five floors of optical illusions and hands-on science.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Experience park where visitors are told to expect the unexpected.

Olfactory delights in San Francisco's Botanical Gardens.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The private clubhouse for the members of the Academy of Magical Arts.

An ethereal glowing blue ocean cave in Croatia.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.