Thousands of years of lost history are being revealed by the extreme weather.

The water level in the River Danube in Serbia plummeted due to the soaring temperatures and lack of rain, causing the Nazi fleet of 20 World War German warships to come back to life.

A WW2 German warship revealed in Serbia by depleted water levels
A WW2 German warship revealed in Serbia by depleted water levels
FEDJA GRULOVIC/Reuters

Hitler's Black Sea fleet was destroyed in 1944 as the Germans retreated from the Soviets.

Some of the Nazi ships still have guns, turrets, and broken masts, according to a report.

Many ships are believed to be buried under the river's sandbanks.

A Nazi warship revealed by droughts in Serbia
A Nazi warship revealed by droughts in Serbia
FEDJA GRULOVIC/Reuters

Serbian transport minister Belimir Trajilovi told local media that there are about 10,000 hidden bombs.

The continental dry spell is uncovering more lost history.

The "Spanish Stonehenge" is a prehistoric stone circle found in Spain.

The dolmen of Guadalperal, also known as the Spanish Stonehenge, is seen due to the receding waters of the Valdecanas reservoir in the outskirts of El Gordo
The dolmen of Guadalperal, also known as the Spanish Stonehenge, is seen due to the receding waters of the Valdecanas reservoir in the outskirts of El Gordo
SUSANA VERA/Reuters

Since 1963, it's been covered by water. The water level has dropped so much that it is now visible, but it has only been exposed four times.

Thehunger stones are found in dried up rivers. There were low water levels in the past.

A bad harvest, lack of food, high prices and hunger for poor people were all caused by the dry spell, according to researchers.

A view of the 'hunger stone,' which dates back to 1616.
A view of the 'hunger stone,' which dates back to 1616.
REUTERS

An inscription on a rock in the Elbe River near the northern Czech town of Dn states "If you see me, then weep", according to The Guardian. Life will become more colorful when this goes under, says one person in Germany.

In Italy's River Po, the heat exposed a 1,000-pound WWII bomb dropped, and 3,000 residents were evacuated while bomb disposal carried out a controlled explosion of the U.S. manufactured device.

The 100,000-year-old skull of a deer and other animals have been found in Italy.