Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

There must be a pun in this haystack somewhere...

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.

The most confusing clock in New York.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The greatest real estate coup of all time.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

The world's largest piece of copyrighted artwork.

Ice cream stand, snack bar, and time capsule of milk conveyance.

"Mock all and sundry things, but leave the saints alone."

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The oldest Italian café in Boston, this spot also serves as a veritable museum of vintage coffee ephemera.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This impressive Boston holy house is the American mecca for Christian scientists.

Statue commemorating the use of ether in anesthesia.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.