Places Jan Claus Di Blasio Wants to Go

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This abandoned Brutalist treehouse is a hidden architectural relic.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

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

The giant skeleton sculpture is surprisingly well-traveled.

An ancient artistic garden parlor full of hidden water wonders.

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

The location of the last witch trials of Italy, known as "The Salem of Europe."

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Natural cathedral designed by Italian artist Giuliano Mauri.

Abandoned medieval hill town.

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

This 16th-century monastery has been turned into a surrealist architecture compound.

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

The underground sanctuary of a mysterious ancient cult.