Some islands... they come, they go, especially on Lake Travis.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

Concrete pillars provide a beautiful canvas for Quebec City's graffiti artists.

This famous church is adorned by a mural commemorating the independence of Vatican City.

The floating gallery illuminates the heart of Québec City's arts district.

Its columns were all carved from the same white oak tree.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This sprawling, formerly elite sporting complex in Amman, Jordan has become a local picnic spot.

A Tudor-style castle in Brazil holds one of the world's largest armory collections.

The massive gardens and office of a Brazilian sculptor.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

When you're a great Russian Tsar, even your vomit gets a statue.