Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Perhaps the most spectacular grotto along the Algarve coastline.

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Lie in a hammock where George Washington stood.

A semi-scholarly approach to sex.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

A tree that grows parallel to the ground was declared Brooklyn's "crowning curio" by the poet who saved it.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This secluded ruin was once a home for exotic plants.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

Ride the subways of yesteryear.

The only subway station in the city that still makes use of gap fillers.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.