View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Catch raucous live performances of traditional tunes at this old-school taverna.

Rest stops along this pathway offer some of the best views of the Acropolis of Athens.

Savor sheep milk yogurt at the last of Athens' dairy bars.

A network of concealed passageways lies within a busy London Underground station.

The only Ottoman Mosque in Attica outside central Athens.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

The world's oldest bookshop still in operation.

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

A former royal garden with lush surroundings in the heart of the city.

This century-old, family-run bakery specializes in loukoumades, a Greek doughnut once served to ancient Olympians.

This lesser-visited World Heritage site in Athens boasts an impressive ensemble of medieval gold mosaics.

An ancient site that has revealed incredible artifacts including portions of the Themistoclean Wall.

The Acropolis house that became Modern Greece’s first university.

This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

This post-Ottoman era church in Athens was built by locals to serve the residents of Anafiotica

Hidden under a center for the elderly are the dungeons which were used during the Spanish Inquisition.

The second oldest surviving house in Athens was owned by an Irish General.

Gladiators once walked this ancient, subterranean passage.

A martyred saint built a nunnery and school for girls here known as the "Parthenon."

One of the best collections of Byzantine art housed in a magnificent, 19th-century neoclassical home.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

An ancient Greek monument and a Byzantine church coexist inside this cave.