This colorful gate stands as an entrance to the walled city of Old San Juan.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

Honorable ranks graduating from the prestigious Army War College work hard to maintain their high standards of honor and erase those who don't.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

As its grandiose name implies, this wooden dome is unsurpassed in size.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

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

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

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.

Art deco landmark on the outskirts of Washington, D.C.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

A beer pipeline runs beneath Bruges.

A little sculpture with a large wardrobe.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Climb inside an iron crystal magnified 165 billion times its normal size.