The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

The ruins of New Zealand's largest classical-style church.

After the devastating 2011 earthquake, historic Christchurch begins to recover, starting with the pop-up Re:START mall.

The western face was supposedly left clock-less to snub the Welsh.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

A mysterious demonic figure peers down from its perch within the gorgeous Chester Cathedral.

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

This police call box harkens back to an era of pre-radio communications, and has a rather unique feature.

One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

An enormous steel waterfall is a nod to the substance that shaped Britain's Steel City.

One of the last doorless, continuously moving elevators still in use in the U.K.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.