Flamboyant architecture from the turn of 20th century.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

A Mayan village preserved for centuries in volcanic ash.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.

This incredibly diverse research station is one of the largest tropical botanical gardens in the world.

These Honduran caves earned their magical nickname thanks to reflective bone deposits.

Fenced off in a garden cemetery in Honduras lies the grave of the most notorious American filibuster.

This ruined castle perched atop a rocky peak is a great place for a hike.

A mansion where wonders of Christmas are celebrated all year long.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

Relics from an era long gone, sit idle outside this Estonian museum.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

A former imperial sea-fortress and Soviet prison.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.