These mythological giants take time out of their busy day guarding a Victorian market to let you know what time it is.

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

Nine limestone rock stacks on Australia's "Shipwreck Coast."

An opal mining town in the middle of Australia where people live, worship, and shop underground.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The ancient tomb acts as a calendar that keeps perfect time.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A hugely vast Irish landscape of barren rock that stretches for miles.

New York City's smallest piece of private property.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Try not to get slimed in Tribeca.

The "Seinfeld" diner.

The first piece of public art dedicated to LGBT rights.

A way to take your secrets to someone else's grave.

There must be a pun in this haystack somewhere...

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.