This is the last surviving Bollman truss bridge in the world.

This Annapolis home was built by one of the signers of the Declaration of Independence.

A charming tour of the umbrella, tin-can, and drinking-straw capital of the world.

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

At the birthplace of American railroading, a world-class collection of historic trains.

FDR's Art Deco hospital tower was hopelessly inefficient.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

The world's oldest continuously operating airport was founded by the Wright Brothers.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

A short boardwalk through a swamp leads to the spot from which the Louisiana Purchase was surveyed.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

The king of U.S. high points towers over every other peak on the continent.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

This roadside attraction in the woods of Mississippi is a scalable replica of the Holy Lands during biblical times.

Striking images of New Orleans history, including colonizers, soldiers, Klansmen, scientists, sharecroppers, and more, are depicted in frescoes that line the walls of this transportation hub.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Charles Babbage's proto-computer, painstakingly brought to life.

London's smallest police station is barely the size of a phone booth.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Hidden beneath the streets of London is a secret subway that only carried mail.