A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A historic house left in "dramatic still life."

A mysterious artist-run cabinet of curiosities and library.

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

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.