A defensive fortification carved into a cliff near Sydney Harbour.

A series of gun powder chambers currently hidden from view within Nobbys Headland in Newcastle, Australia.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

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

The remnants of a facade from a 19th-century market stall emporium.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

A roadway designed for a visiting monarch.

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

This Scottish graveyard is the final resting place of the man who inspired the character Ebenezer Scrooge.

The building where Mary, Queen of Scots was said to have bathed in white wine.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

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

This giant, granite purse is one of Melbourne's most unique and distinctive pieces of public art.

A unique underground car park that has become a popular filming location.

The ornate structure is part of a building boasting more marble than the Vatican.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

It's home to the taxidermy remains of Peter, the dog who helped convict a murderer.

This little-known national museum houses over 40,000 works of art from across the world.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.