The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This cupola was once seen as an architectural disaster.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

See four top-secret US spy aircraft of the Cold War era, including the legendary SR-71 Blackbird and the A-12 Oxcart.

Thousands of turbines whir at at the origin of North American wind power.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

An out-of-the-way wildlife haven with a rich and storied past of harboring thousands of fugitive slaves, or "Maroons" during the mid 1800s.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

There is only one place in the world where the corners of four nations come together.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

A 19th-century relic of timekeeping.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

Since the 1700s, this old barrel has acted as a post box that relies on the kindness of travelers.

The first official clock in North America, it kept time for the Spanish government of Santo Domingo.

One of the oldest living oak trees in the Southeast.

This fountain was designed to honor the man who helped bring water to Barcelona.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.