A massive volcanic plug is now a protected area that hosts a number of bird species.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

These wooden pipes were crucial to providing water to Medieval Edinburgh.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The Great Fire of London and the regulation of one-way streets both started in this alley.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

A bronze monument to Cleveland's favorite, fastest son.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Home of an evil witch famous within southern folklore.

This replica of the Greek structure is in the heart of Nashville.

Victorian-era Egyptomania left its mark on this Nashville landmark.

The alley connecting two of country music’s most historic venues has a rich history of its own.

Three bronze deer sculptures relax along the Scioto Mile.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

The medieval woodcut-style artwork chronicles life in medieval London.

A living memorial to the trees London lost during the Great Storm of 1987.

A public statue crafted by Singapore's pioneering sculptor, Ng Eng Teng.

This statue was a gift to commemorate the Thai monarch's first visit to a foreign land.

Singapore's oldest Hindu temple.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."