A museum wholly devoted to juvenescence.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

Hot springs monkey spa in the middle of Hell's Valley.

A taste of the macabre Tokyo's ritzy shopping district.

A Nesting Doll of Churches.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

The largest and most famous wax anatomical collection anywhere in the world.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The mummified relic of St. Antoninus.

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

Secret refuge and museum of the Duke of Florence.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The final resting place for the remains of 143 Habsburg royalty.

One of the best collections of wax anatomical models in the world.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A saintly relic hidden in a Prague church basement.

A church of bones, decorated with 40,000 human skeletons.