The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

One of Ireland's most infamous prisons for rebels including men, women and children.

This public art pays homage to the baseball legend and civil rights icon and his time in Montreal.

This famous church is adorned by a mural commemorating the independence of Vatican City.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Its columns were all carved from the same white oak tree.

A historic Montreal market that was the city's agricultural hub for over century.

Every year, the colorful murals of Montreal get a complete makeover.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A glimpse of the Pacific Northwest‘s indigenous culture in Washington, D.C.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

The only female equestrian statue in Washington, D.C. is a 15th-century French heroine.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

Garments from across the globe call this hidden gem home.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

The National Park Service’s best-kept secret with views that rival any in D.C.