Where the alchemists dream of transmuting base metal into gold was actually achieved.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

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

The site of Paul Revere's historic two lantern warning.

An enormous, inside-out glass globe built in 1935.

This print shop boasts one of the largest pinball arcades in San Francisco.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

The birthplace of the Ford Model T is now a museum full of antique cars.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

A Beaux-Arts triumph set to become Ford's innovation campus

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

This sprawling bookstore spans four floors and has more than a million books in stock.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.