Go inside to really appreciate this 500-year-old technological masterpiece.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Ancient serpentine sacrifice holder that has stood the test of time.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

1513 Turkish world map, full of European state secrets and snarky commentary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

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

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

FDR hoped to find a cure for polio in this Georgia town's warm springs.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

This rare female version of the Muffler Man has its clothes removed each summer to signal the start of pool season.

The world's third-largest scale model of the planets.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.