A winding district gerrymandered into the shape of a mantis.

This four-story steel sphere in Maryland was used to test biological weapons.

A Civil War Museum with some notable medical antiques.

Built by the patriotic residents of Boonsboro in a single day.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

This subterranean necropolis holds three floors of antler-dug grave caves.

Dynastic Home of the De Piro Family.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

These fantastically named natural pools look like something out of a Scottish myth.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Atop the former site of a historic bakery sit two stone tributes to Verona's contribution to traditional Italian baking.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

A Milanese café entirely designed by the American director Wes Anderson.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

A roadway designed for a visiting monarch.

A multi-storied painting that depicts the area's rich and diverse maritime history.

The remnants of a facade from a 19th-century market stall emporium.

An artistic interpretation of the history of a Scottish park, combining poetry with anthropomorphic animals.

Once designed as a natural history museum, this building is now home to a massive art gallery.