Portugal's National Pantheon has a history of curses, collapses and financial problems.

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.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A quiet Sicilian village is home to a cafe that had an important role in "The Godfather."

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

At 207 feet, one of the world's longest continuous escalators.

The national park was once a plantation estate.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This eye-catching sculpture of rural life seems a bit out of place at a suburban intersection in front of a car dealership.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

This former Cold War missile control site played an important role in the creation of GPS.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

Volcanic stone sentinels stand watch at a Korean Bell Garden in Virginia.