A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

This famed marionette theater and museum is bursting with imaginative string puppets.

One man's personal kunstkammer, museum and shop.

Housed in an old church, this hunting museum holds a collection of mythical bird-rabbit creatures.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A grassroots community effort in the 1970s led to the creation of this beautiful garden full of delightfully whimsical exhibits.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

An underground magnet for ever-changing street art.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Ancient snack bar of the Roman Empire re-opened.

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

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

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

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th-century horror show built in a lovely Italian garden.

An alchemist's "magic door" stands in the middle of a Roman park.