The world's "leaniest" tower encourages you to test the gravity of its situation.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Aqua white sand highlighted with fiery red rocks.

Thousands of lawn gnomes have infested this Australian roundabout.

One of the best beaches in the entire world.

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.

A giant sculpture head with an optical illusion dedicated to the longtime conductor of the Boston Pops.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The massive machine creates cracking displays of indoor lightning.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

This tribute to the fictional detective stands at the famous literary character's address.

The world's first purpose-built motor racetrack was destroyed by the outbreak of two world wars.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

Remains of a keep that was built shortly after the Norman conquest of England.

One of the world’s oldest surviving convict prisons, once the scene of daring escapes and riots.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

Ice cream stand, snack bar, and time capsule of milk conveyance.

An unusual and powerful memorial in which earthquake victims are remembered by empty white chairs.