Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Love is in the air along the small street in Brooklyn.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Elevated freight railway turned wildly successful urban park.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

Shop for books in the New Orleans house where William Faulkner once lived.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

The curiosities and wonders of pharmacy in a delightful historic building.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The final resting place of New Orleans' most famous voodoo priestess.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.