At a Glance

The world's longest and highest-bottomed glass bridge opened in Hunan Province, China, on Aug. 20. There's no word on when it will be reopened.The bridge is located at Zhangjiajie Mountains, the UNESCO World Heritage site that inspired the Hallelujah Mountains depicted in "Avatar".

After being open for just 13 days, the world's longest and highest glass-bottomed bridge in China's "Avatar" mountains has already been closed.

According to China Daily, the bridge shut down due to . The attraction drew more than 10,000 people daily despite the set limit of 8,000 visitors per day. The management committee of the bridgeannounced an "internal system upgrade" would be undertaken while the bridge is closed. There was no word on when the bridge would be reopened.

"We're overwhelmed by the volume of visitors," a Zhangjiajie Grand Canyon marketing and sales department spokesperson told CNN. When asked if the bridge had been cracked or damaged, the spokesperson said "there was noproblem" and confirmed there have been no accidents.

A visitor strikes the glass-bottomed bridge with a hammer for a safety test at Zhangjiajie Grand Canyon on June 25, 2016 in Zhangjiajie, Hunan Province of China. World's tallest and longest glass-bottomed bridge has been completed and took a global broadcast through television and internet medias to show its safety. More than thirty citizens and visitors struck the bridge with a hammer in the test event.

(Photo by VCG/VCG via Getty Images)

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Visitors were so excited to be the first brave souls to cross the bridge that many lined up the night before to be first in line to traverse the 1,400-foot expanse, some 984 feet above the ground below. Now that the bridge has been closed, those that were hoping to see the marvel up close aren't too happy.

"I have booked everything and now you are saying you are closed ... Are you kidding me?" a user on microblogging site Weibo wrote in a responseobtained by CNN.

The bridge, which opened to the public on Aug. 20, crosses between two peaks in the mountains of Zhangjiajie — the same mountains that were reportedlydepicted in the popular 2009 James Cameron film "Avatar."

To demonstrate the bridge's safety, especially after a glass bridge cracked in YuntanMountain in 2015, authorities at Zhangjiajie organized a series of media events that encouraged people to try and smash the bridge's glass panels with a sledgehammer. In another, a car was driven across the bridge to demonstrate the integrity of the structure.

The cost of a trip across the glass bridge above the "Grand Canyon" of China comes to about $20, but you must leave behind your selfie stick and stilettoheels, as they are banned from the mesmerizing experience.

It's not yet clear when the bridge will be reopened to the public.

MORE ON WEATHER.COM:Zhangjiajie, China Glass Bridge

Visitors cross the world's highest and longest glass-bottomed bridge above a valley in Zhangjiajie in China's Hunan Province on August 21, 2016.