This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

A tree that defies gravity grows in an ancient ruin.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

Plenty of old carney magic still haunts this photogenic amusement park.

Thousands of well-dressed mummies below a monastery.

The remains of the oldest bone-headed dinosaur in North America.

A touching tribute to the "Wonkey Donkey."

Known as "Toronto's Flatiron."

Named after one of Canada's greatest writers who lived out her days in this quaint neighborhood.

The remains of a once-famous hotel that also acted as an artist colony.

The artwork commemorates the many ways 20th-century people perished while on the clock.

This half-ton piece of the Alps sits at the base of the CN Tower.

Canada's largest dinosaur skeleton was hidden away in storage for more than 40 years.

This knick-knack-covered house (complete with a matching van) is a charming oddity in the middle of a modest downtown neighborhood.

Along with his smaller donkey pal, he guards the museum’s exhibits and memorabilia.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

This overlooked gem outside Niagara Falls preserves and celebrates Iroquois culture.

Toxic waste disaster that founded the Superfund program.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

A journey to a hand-crafted island involves a trip across this lattice bridge.

A sculpture garden built by a retired durian farmer.

This house was once the location of Frelinghuysen University.