The first modernist church in Europe.

The Habsburgs' royal collections of art and wonders.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

A beautiful but toxic fountain of mercury.

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.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

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

Come for the flowers, stay for the bats!

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

One of Australia's largest secondhand bookstores.

A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Burial mound for the ears and noses of thousands of mutilated Korean soldiers.

A shrine contains nearly 200 statues of the Buddhist deity Jizo, dressed in bibs by parents who have lost a child.

Peace Park and the Atomic Bomb Dome.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.