Campus tradition says couples who walk beneath this enormous oak will stay together forever.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

Two small markers remember the Alamo's feline protectors.

This gravity-defying rock formation is one of Big Bend’s natural wonders.

A daybeacon pyramid is about all that's left of this island that is said to have sunk due to a pirate's curse.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

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

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

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

A giant sculpture head with an optical illusion dedicated to the longtime conductor of the Boston Pops.

An unassuming 13-acre park is home to over 12,000 roses.

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

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

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

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

Whether or not you take the 72-ounce steak challenge, there’s plenty of history, fun and Texas-style food at this legendary stop along Route 66.

A symbol of Texas pride.

As the oldest structure in Harris County, this 200-year-old frontier cabin stands in the literal shadow of downtown Houston’s massive skyscrapers.