In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

This jail which was in service for over a century is now open for curious visitors.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

It would take 35 firetrucks to fill this enormous glacial pothole.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

Yo, Adrian!

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

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.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

An Industrial Revolution-era public work that purified water using nothing but sand.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

See the computer’s history revealed over the course of 20,000 years.

Four miles of pipelines form the model of still-functioning retro-tech efficiency.

Extremely long cable tunnel buried under the river.