Taking the subway here means doing so over a bridge located in the middle of an estuary.

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

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.

An eclectic treasure trove of maritime marvels.

This tiny museum's sizable collection is jammed into a former underground public toilet.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

These moss-covered medieval ruins tower atop the smallest of Ireland's Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

Did Inca children also slide down these smooth rocky slopes above Cusco?

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This striking, two-toned confluence of rivers is visible from space.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This stunning mass of ice spans 121 square miles and is still growing.

This unusual apartment building may be Brooklyn's own version of the Leaning Tower of Pisa.

The unassuming structure was part of a Major League Baseball stadium.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.