The hellish conditions of this abandoned mine that snakes beneath the Pacific Ocean gave it its diabolic name.

This little-known national museum houses over 40,000 works of art from across the world.

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

The stunning interior of this Gothic church is covered in ornate gold details.

The world's oldest bookshop still in operation.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

Unusual books about food and drink abound in this 19th-century New York townhouse.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Order scoops of pandan, lychee, and black sesame at this family-run institution.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A terrific purveyor of natural history objects and curios.

Five acres of divinely inspired folk art.

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

David Sedaris called it "The greatest shop in the world."

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Five candy-colored villages on the Italian Riviera.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

The oldest operating pharmacy in the world features 800-year-old recipes.