Famously misunderstood wonder of the ancient world

360° views of the city plus five floors of optical illusions and hands-on science.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Catacombs turned marketplace.

A historic presidential getaway on the continental United States' southernmost island.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

Stay in the one time home to one of Scotland's most notorious gentleman's sex clubs.

Try not to get slimed in Tribeca.

Ancient snack bar of the Roman Empire re-opened.

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

Baroque celebration of the end of the Great Plague of Vienna.

Real bones which are said to have belonged to a Polish dragon.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

The largest freshwater lake in the Florida Keys.

A monument celebrating the idea of reaching inaccessible places.

Stay in a room with a view... of the bottom of the ocean.

Secret refuge and museum of the Duke of Florence.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This freshwater spring fills with 10,000 gallons of water per minute.

Largest lake in Great Britain measured by surface area.

Largest Roman Catholic church in North America.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.