This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The construction of this bridge dates back to the 15th century.

This massive memorial commemorates those who died in the Manchester Arena bombing.

The city of Manchester quietly unveiled this tribute to a 19th-century massacre.

The small bright red pillar survived the 1996 Manchester bombing virtually unscathed.

Be on the lookout for the symbolic insect all over the city.

Have a seat with the father of modern computing at this Manchester monument.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Clusters of huge boulders in the Australian Outback.

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

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

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

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

An extravagant monument to an extravagantly unpopular Emperor.