Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

This Aztec structure remained hidden until the demolition of a supermarket exposed the lost temple.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

An extravagant 18th-century fountain built with bits of broken ceramic.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

Frida Kahlo's childhood home, now a museum of her life and works.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Millions of numbers carved in glass represent the tattoos forced upon victims.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

The world's largest piece of copyrighted artwork.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Historic Hull Street was actually the first street with a proper name in the Boston area.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

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

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

From bench to vandalism to art, this silly prank seat was funny enough to become permanent.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.