The ruins of Scottish sea salt production.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The oldest public library in Ireland.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

An ancient burial ground believed to have been used for ritual sacrifice.

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

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

An English explorer's vast natural history collection has the first realistic dioramas of animals staged in their natural habitats.

The luxurious English estate houses the world’s largest private collection of French Rothschild wines.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.