Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

The actor best known for slapstick comedy is memorialized in his home town.

This general store has stood in the same spot for well over a century.

This old ruin once served as a post office, a train station, a restaurant, and a bridge to the Atomic Age.

Built in 1945, this historic train station has a new lease on life with its baggage area serving as an event space.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

The state's only comprehensive museum dedicated to the mineral that defined its history and economy.

Inside this garden, visitors are offered a glimpse into how inhabitants of the region survived centuries ago.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

This small town was built around a marble quarry and named after one of the most famous sources of marble in the world.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

This Native American settlement dates back to the Pueblo II period.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

This statue honors the author's groundbreaking family story.