The Bristol Camera Obscura housed in an ancient windmill.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

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

A hands-off space for graffiti artists to hone and display their skills.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

65 million-year-old chalk outcroppings mark the end of the Jurassic Coast.

England's most notorious suicide spot.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

An architectural oddity hides in plain sight on this iconic London bridge.

Banksy's image of a naked man dangling from the window of a sex health clinic.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

Swedish skyscraper with a 90° twist.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

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

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.