One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

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

In Warrington’s Golden Square, it's always tea time.

This 20th-century replica of a 13th-century castle has itself fallen into ruin.

A typographic tribute to the many comedic greats who make Great Britain laugh.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The modern birthplace of Irish freedom.

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

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

The castle still holds traces of the abandoned Roman fort it was built atop.

Recently restored menagerie of Victorian-era beasts.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

This stone once marked the boundaries of Liverpool's medieval markets.

This bronze statue was dedicated to a 1966 Beatles hit.

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

A memorial to the politician who became Great Britain's first fatality to be caused by a locomotive.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

This whimsical public art installation is a unique homage to Liverpool's industrial heritage.