This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

One of the only memorials dedicated to journalists who died in combat.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

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

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

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

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

Built by the patriotic residents of Boonsboro in a single day.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Bizarre Cavern.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

Single runway interrupted by a busy road that cuts across its middle.

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The ritual has been performed uninterrupted for nearly 700 years.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.