This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

A public urinal so pretty, it was declared a national monument.

The last Viking king of Denmark is buried inside the crypt of this cathedral.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

Described by William Wordsworth as a "World of Wonder."

History is on display in this hall, which has served as the seat of city government for centuries.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

This spooky statue sits outside a famous Prague theater.

Looming communist pillar with a Czech twist.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This doorless 20th-century elevator doesn't stop or slow down.

This lonely rock has been turned into a character loved and feared by children.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

This small statue hints at the incorrect origins of the lush landscape park surrounding it.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This sprawling bookstore spans four floors and has more than a million books in stock.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A museum dedicated to the legacy of Bob Moog and his pioneering synthesizers.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Stockholm's tiniest statue is of a small boy looking at the Moon.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

A fiery crater has been burning in the Karakum Desert since 1971.