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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This innocent-looking townhome is actually a subway exit.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This ancient Spanish castle sits high upon a hilltop.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

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

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

The quintessential Japanese rock garden has existed for more than 500 years.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

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

A crumbling hospital from the 1850s on Roosevelt Island.

This beautiful Japanese garden is a memorial to the samurai who literally wrote the book on business as martial art.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

An ordinary pond with fish from out of this world.

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

Nine Gardens in one—with tea service.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

The mysterious remains of a martyred teenage saint are venerated inside a small country chapel.