This 900-foot structure with 20 arches crossing a Scottish river was built in the late 19th century.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

This museum is home to one of the largest private collections of seashells in Australia.

This work of art pays tribute to an iron-hulled paddled steamer that traveled the world.

Though it may look like a Modernist cathedral, this structure was built to store massive quantities of grain during World War II.

A unique rock formation that only a few have managed to venture inside.

Australia's oldest artists' colony.

This area was created to save the region's koala population.

To commemorate a century of gold mining, this Australian city built a monument that features a replica of a 150-pound gold nugget found there in 1858.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

This Melbourne bank has unique Gothic-style architectural features and is one of the most majestic operating bank branches in the world.

A conservation sanctuary for rescued koalas, some of which were saved from devastating Australian bushfires.

This curious Tudor-era castle was once home to Napoleon's greatest adversary, the Duke of Wellington.

These formal gardens were designed to be admired from the vantage point of the castle.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

This 20-story artwork on a public housing block is the tallest mural in the Southern Hemisphere and tells the story of a community.

One of the first intercontinental ballistic missile sites in the United States.

It's said this was once the home of King James V's pet lion.

This modern pedestrian bridge on the Yarra River was modeled after an Aboriginal fish trap.

The gathering point of an old Melbourne swimming club was site of a historic, world-record dive in 1918.

This plaque commemorates an amazing 19th-century sea rescue.

A poignant memorial to remember the Australian nurses who lost their lives during the Second World War.

A bronze statue pays tribute to the Hungarian player and coach, one of soccer's first international superstars.