Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A cheeky architectural easter egg.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Annual technopop celebration of peace and love.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This Elizabethan hedge maze is one of only six in North America.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.

The Guardian of Tallinn.

"There's nothing there," and other lies the KGB told us.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.