10 famous and expensive structures around the world that are now abandoned

• Some of the most expensive structures ever built now sit empty.
• A luxury resort in Croatia, Olympic venues in Brazil, and an airport in Greece are just a few of these pricey constructions that are now deserted. 
• These places became abandoned for various reasons, ranging from mismanagement and financial troubles to nuclear disasters.

Around the world, massive structures that likely cost millions to build, including amusement parks, airports, resorts, and Olympic arenas, now sit abandoned.

From Olympic venues in Brazil to an amusement park that was meant to be the largest in Asia, these constructions were abandoned due to financial woes, mismanagement, war, or even nuclear disaster.

Here's a look at some of the most expensive structures ever built that now sit empty, many of them in ruins.

SEE ALSO: 10 abandoned mansions around the world that likely used to be worth millions

The Hellenikon International Airport in Greece used to be Athens' main airport, serving over 12 million passengers a year.

Source: Business Insider

But the airport closed in 2001 after being replaced by Athens International Airport, and it has sat abandoned ever since.

Source: Business Insider

Several plans to redevelop the airport have faltered. But a development group recently promised to start transforming the site into a metropolitan park starting in 2019, which will include residential areas, hotels, shopping centers, theme parks, museums, sports facilities, and more.

Source: Greek Travel Pages