Places Robbert Wants to Go

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

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

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Thousands of well-dressed mummies below a monastery.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Stunning wetlands ablaze with pink lotus flowers.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

A true Valhalla for cactus and succulent lovers.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

This house's itty bitty size means no humans allowed.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Vibrant street art created with mixed media.

Giant marble phalluses on the sacred island of antiquity.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

A former plague hospital turned medical museum.

A preserved building where the dead were once watched for signs of life.

A mecca for India's Jains.

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