This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

A beautiful Victorian-era cemetery, complete with a miniature village.

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.