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

Cockatoo Island is a Heritage-listed island in the middle of Sydney Harbour.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Living fossils in this remote Australian bay provide a glimpse of what Earth may have looked like 3.5 billion years ago.

A beautiful hike through national parks, forests and beaches in Western Australia.

Alien rock formations grown from the sands of an Australian national park.

A metal skywalk leads to the top of this striking granite outcrop in Porongurup National Park.

Wild seas have created two spectacular formations just a stone's throw away from each other.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

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

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Visible at low tide, this rusting vessel is one of the last surviving examples of the X-Class "Midget" submarines.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

The sign at the garden gate reads: "These Plants Can Kill."

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This museum honors the young maritime hero who became an unexpected Victorian-era celebrity.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

Another entry into the world of Edinburgh's pop-up artworks.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.