Massive prehistoric mammals used these stones as oversized scratching posts.

Believe it or not, this is the final resting place of the man who created the Odditorium.

This California family's ancestral melon is sold only here.

340 bicycles, 65 feet high.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

What if the cure for all that ails you was as simple as repeated exposure to low-dose radon?

The second-tallest water tower shaped like a peach in the American South.

This oddly shaped boulder in Paris is rumored to be cursed.

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

In 1810, free people of color made up more of New Orleans's population than any other Southern city.

A short interpretive trail about one of the first human cultures in North America.

One of America's oldest stadiums was also the site of one of the most brutal anti-labor acts in American history.

This large garden vase urn has nothing to do with the seventh U.S. President—it was designed by one landscape designer to honor another landscape designer's contributions to the National Mall.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

A 20-foot-tall quarter commemorates George Washington’s ties to Bedford County.

Shaped like a big top tent, this memorial honors the victims of a terrible train wreck.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

That bass was as bad a fish as any angler ever knew.

An autonomous oak in Alabama.

This 12-foot-tall T-rex is the largest K’Nex skeleton sculpture in the world.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.