In the 19th century, this was the center of Boston's Black community.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

Historic home of a Black veteran of the American Revolution and one of the earliest civil rights activists in the United States.

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.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This statue intended for children to enjoy became a minor political spat.

Dedicated to one of the darkest moments in Irish history.

A tiny plaque marks the location of the water source that facilitated the birth of modern-day Boston.

These whimsical works of art tell the story of the city's past and present.

What may be Boston's finest Art Deco building, located in the city's Financial District.

Barça football fans might see the insignia hidden in a church window as a divine sign.

The unexpectedly beloved remnants of a controversial thermal power plant.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Historic medieval fortified city in southwest France.

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

This generously endowed statue once stood guard outside a Roman home.

A science fiction-inspired apartment building designed by a famous Spanish architect.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.