Places Ennigaldi Wants to Go

A museum befitting the city responsible for supplying the majority of the world's LSD.

A 140-year-old castle with underground caves hidden in San Francisco.

A huge musical instrument played by the ocean.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

A naturally mummified 2,000-year-old man.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Rebuilt remains of a temple to Roman god Mithras.

Hear the quietest sound from across the dome.

The curios of pharmacist and collector Henry Wellcome.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

An unusual round church in London with a Templar past.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

These mansions date back to Chicago's days as a brewer's paradise.