The most powerful waterfall in all of Europe.

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

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A crumbling hospital from the 1850s on Roosevelt Island.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

Rummage through this sunken ship, but leave your scuba gear at home.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Elevated freight railway turned wildly successful urban park.

Phil Mortillaro uses keys to bring art back to the Village.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

A mysterious "wedding cake" castle in the middle of the urban desert.

This memorial complex contains several mass graves for victims of the Siege of Leningrad.

This massive monument honors the first human in space.

One of the world's tallest statues is also one of its most hated.

Stalinist skyscraper built with help of cryotechnology.

World's largest bell sits on the grounds of the Kremlin in Moscow.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.