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

A Neolithic tomb hidden among a spectacular boulder-strewn stretch of coast.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

This 19th-century island fort built to protect against an invasion by sea.

The largest of only eight working transporter bridges left in the world.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

Three bridges straddle a stream, one stacked upon the other.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

This historic abandoned train station looks like a stop for ghost trains.

These constructed wetlands naturally filter millions of gallons of treated wastewater every day.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

When it comes to handsignals (and colonialism) rock always beats scissors.

Before Nixon, "watergate" meant canals.

The most accurate timepiece in the world.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

More than 300 years old, Kyoto's historic "teahouse" still operates as an invitation-only geisha club.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.