Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

Eighty million natural history specimens call this gargantuan museum home.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The "Little Ones," show Portugal in full miniature splendor.

Pagan monument converted to Christianity with the population.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

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

This crumbling Portuguese ruin overlooks the populace it once ruled.

A unique seaside cave where Aleister Crowley faked his own death.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

The world's oldest bookshop still in operation.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

An ancient capital city that dates back 3,000 years old and harbors many surprises.