This landmark cemetery in Boston was created more than 300 years ago.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Pilgrimage site for star-crossed lovers.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

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

The glowing blue Nymphaeum of Emperor Tiberius.

60 feet of towering steel balances gracefully.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.

This beautiful site is where the first transatlantic telegraph was sent from.

See some of the world's greatest racing horses at this idyllic thoroughbred breeding facility and garden complex.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

The modern birthplace of Irish freedom.