The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

Once America's tallest structure, now a Baltimore landmark.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The land is home to swimming ponies and a legendary 18th-century treasure.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The oldest university museum west of the Mississippi retains its 19th century feel.

Millions of dollars worth of sculpture decorate this Iowa city center.

A mysteriously dark cemetery monument fuels stories and legends galore.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

Home with Gothic windows featured in a famous painting.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

These lush botanical gardens employ the most purrfect pest control force.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

A local prank turned town icon.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The first of Lancaster's "rural cemeteries."