This now-abandoned shopping center in Playa del Carmen was built to resemble a medieval European castle.

Created by a local artist, these quirky sculptures each have their own names and personalities.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

This haunting monument honors the victims of 9/11.

This colorful boulder serves as a canvas for political statements and artistic expression.

This Tudor-style mansion is home to the first roadside confectioner in the United States.

The oldest brick saltbox house in America.

This Alaskan town appoints the general store's resident feline as honorary mayor.

New Hampshire's first neighborhood is now preserved as a historic village with live action role players.

Sip a cappuccino in the historic cafe that introduced them to the United States.

Built in 1981 in collaboration with Andy Warhol, this giant piece of pop art stands on the campus of Colorado State University.

A gift to the children of Boston, this bronze bear represents playfulness, a spirit of love, and the warmth of big hugs.

Dedicated to the neverending mathematical constant, this plaque next to a park bench was sponsored by an anonymous benefactor.

A stone marker commemorating the first time sound was transmitted over wires.

The former home of a Boston physician whose murder led to a revolution in forensic science.

Dedicated to a colonial woman who was hanged for being a Quaker.

A tribute to the area's namesake and King Edward VII.

Mumbai's angel.

A tribute to one of Bombay's former governors that has withstood the test of time.

An architectural marvel that combines Gothic architecture with Indian elements.

Where a demonstration led to equal rights for one of California's most marginalized communities.

A monument to one of the few Olympic flames ever to be lit outside of the host city.

The largest battery in New England sits atop a Massachusetts mountain.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.