The oldest surviving botanic garden in the United States.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Where America's first doomsday cult awaited the end of the world.

Mysterious rocks that ring musically when struck.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

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

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

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

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

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

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

The humble field where the first Major League Baseball game was played.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

This rare polygonal meeting house is rumored to be built in a circle so that the devil has nowhere to hide.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.