Lucha Libre (Mexican Wrestling) themed taco shop.

This mysterious artificial cave has long puzzled New Englanders.

The preserved house of a jazz legend still echoes with his music.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

One of the now-less-hidden floral gems of the "Emerald Necklace."

This electronics repair store celebrates the history of computers.

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

The Boston home of a conductor on the Underground Railroad.

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

The last remaining 19th-century tenement from Boston's old West End neighborhood.

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

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Sacks of potatoes, made of cast stone, mark where the iconic potato sheds once stood along the river.

A mysterious stone embedded at the base of a historic Boston building.

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

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.