Get in line for Lisbon’s most famous sandwich.

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

Sip cherry liqueur at a bar dating back to 1840.

A hidden three-foot-wide house separates these two regal churches.

The world's largest military aircraft cemetery.

This church on a Tohono O'Odham reservation has stood since 1797.

This bomb shelter-themed bar has barely changed since it opened.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Visitors to this public park will also find the ruins of an old western fort.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

A rare wayfinding portmanteau of “Street” and “Avenue.”

The fading, forgotten remains of a once bright and booming factory.

The last remaining predreadnought battleship in the world has been a museum for nearly a century.

It is said that coins washed in the waters here will miraculously multiply.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

Where commuters walk through remnants of an ancient Greek necropolis.