This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Most-visited and most-photographed slot canyon in the American Southwest.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A crumbling hospital from the 1850s on Roosevelt Island.

An exquisite tunnel of cascading flowers.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

2300-year-old Roman road connecting the empire.

This small Key West museum is packed with dozens of artifacts that illustrate the life of the iconic playwright.

The bank's whimsical shape was inspired by a child’s toy.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

The mystery of this small, brick pond eluded its possibly only investigator until his death.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.