Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

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

The devil-defying mark left by a saint as a boy is visible inside Lisbon's cathedral.

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

Sip cherry liqueur at a bar dating back to 1840.

The scorched Lisbon church that survived two earthquakes and a massive fire.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The bench featured in the film with Robin Williams and Matt Damon has become a popular destination for moviegoers.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

Narrowest house in Boston.

The site of Paul Revere's historic two lantern warning.

The colonial home of Paul Revere during the American Revolution.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Millions of numbers carved in glass represent the tattoos forced upon victims.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.