One of the best examples of a Byzantine period monument in Albania.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

The original version of Porto's most famous sandwich is just as good here as it was a century ago.

Eat the ultimate iteration of Portugal's most beloved pastry.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This castle has links to Portugal’s founding and struggles for independence.

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

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

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

Beatlemania is still going strong... at least in Kazakhstan.

The ruins of a Roman temple from 1st Century BC with the only preserved inscription of “The Deeds of the Divine Augustus.”

This 13th-century UNESCO-listed "lion's house" mosque is named after a repurposed lion sculpture.

The defense built to protect one of the last found pieces of land on Earth.

A modern mini-Stonehenge is hidden in a public reserve, not far from a former Viking stronghold.

One of the shortest streets in York has an especially odd name.

This network of narrow, medieval passages has the most delightful name.

Follow the original medieval paths that wind through this intriguing section of the city.

A century-old tradition has culminated in a small but singular collection of feline effigies.

Once the site of medieval pilgrimage for its healing powers, this well was lost and later rediscovered.

The small bright red pillar survived the 1996 Manchester bombing virtually unscathed.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

The tower was originally used as a chimney for the waste incinerator of St Johns Precinct and Market.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

One of the most spectacular 18th-century bridges in Scotland.