There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

Home of the only civilian casualty at the Battle of Gettysburg.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

The longest covered bridge in Delaware.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

The longest-covered bridge in the state of Maryland.

This historic lighthouse was well known for the large number of women who served as its keeper.

This statue of two men in a rowboat was erected to honor those who died while fishing in the Chesapeake Bay.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

This one-room schoolhouse played a significant role in the education of Black children for almost 100 years.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

The solitary grave of a schooner captain killed by lightning while serving biscuits.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

Museum houses an impressive display of the origin and artistry from the now-quaint invention's history.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Home to items never before seen by the public.