An abandoned 1970s theme park that has been turned into a space for waterfront walking.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Inside this former medieval prison is a collection of objects designed to inflict unbelievable pain and suffering on the human body and mind.

The little-known second castle that William the Conqueror built in York.

This mysterious and unique painting is filled with symbolism.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

The giant birds honor two native North American species.

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

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

An artist's cute bronze subway sculptures belie his violent artistic past.

Elevated freight railway turned wildly successful urban park.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Iconic rock formations that allow for exploration during high or low tide.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

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

This urban oasis is a marvelous meld of music and landscape architecture.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.