An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

A steam powered train that runs on city streets.

1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

This stately clubhouse has showcased German-American culture for over a century.

A grandiose octagonal home crowned by a large dome stands out among the antebellum mansions.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Creek water that starts here has a 50/50 chance of ending up in the Atlantic or the Pacific.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This abandoned train tunnel has been the subject of countless ghost stories for years.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Home to items never before seen by the public.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.