Eight years after Greece spent ~$15 billion to stage the 2004 Summer Olympics, some of those once-gleaming venues are crumbling.

The economy is a part of it, but so is the fact that many of these venues were built only for sports with little local interest (like softball), and now have no use.

A number of Greek officials admitted to the AFP that there was a lack of planning, and no one considered what they would be used for after the Games.

Despite all that, many of the venues from the 2004 Games are still going strong. The Olympic Stadium, Olympic Village, media center, and a few small-scale sports arenas have all found tenants.

But still, the aquatics center, beach volleyball arena, and softball arena are all literally falling apart. In addition, the massive Helliniko Olympic Complex where many events were held has been abandoned, and is in desperate need of private investors, according to AFP.

The photos of these venues are stunning, and a stern warning to future host cities of the importance of long-term planning.

The beach volleyball arena has been abandoned

The 'Agora' outside the Olympic Stadium used to feature a blue pond, now it's brown

A huge jumbrotron above the arena where kayaking was staged at the Helliniko Olympic Complex

The stands of the kayaking venue

The Helliniko complex is currently looking for private investors to revitalize it

The softball stadium is among the most empty

The field has been overtaken by weeds

The stands are falling apart

Dirt and trash is collecting in the hallways and corners