The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

The stately remains of Llywelyn the Great's mighty fortress.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

Three bridges straddle a stream, one stacked upon the other.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A subterranean playground in an abandoned slate mine.

These precariously placed ruins harken back to a 13th-century castle.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

An abandoned castle owned and ignored by Masons carries a cursed history.

This former 17th-century church now houses a university's public library along with several mural masterworks.

A 140-year-old castle with underground caves hidden in San Francisco.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A 13th-century fortified manor house that was once sieged during the English Civil War.

Described by William Wordsworth as a "World of Wonder."

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

This museum is dedicated to the most famous Irish writers in history.

An abandoned village where the ruined foundations cling to a cliff.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

A grotesque Fiji merman dwells within this traditional Dutch-style building.