Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

Elevated freight railway turned wildly successful urban park.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

The "Seinfeld" diner.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

A Gothic-style abode built to accommodate the church's three resident peacocks.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Eat the ultimate iteration of Portugal's most beloved pastry.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

One of the smallest bookstores on the planet.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

Sip cherry liqueur at a bar dating back to 1840.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

The former hotel where Tesla invented the radio.