Tubing through a cave lit with glowworms is a magical underground experience.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

These two delightful animal-shaped buildings host a visitor center and wool shop.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Commemorating the 19th-century labor movement in Australia.

Visible from both land and sea.

This work of public art symbolizes the maritime history and the modern creative industry in Fremantle.

This classic photo booth was saved from destruction by the local community.

A beautiful 1920s tower filled with local hidden gems.

This piece of Australian modern art is part joke and part history.

Not the result of an accident, hurricane, or aliens, this is an eye-popping tribute to the Melbourne tram.

Children's author May Gibbs's beloved stories about the tiny, human-like "Gumnut Babies" are immortalized in bronze.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

The bullet-banged DIY suit of armour belonging to Australia’s most famous outlaw.

A friendly monster lurks outside the State Library Victoria.

This work of art was designed to represent the Tarpeian Way Quarry that once dominated the area.

This letter written by Queen Elizabeth II in 1986 won't be opened until 2085.

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.