The structure, officially called the Monument to the Three Charters for National Reunification, was completed after an inter-Korea summit in 2000.
The two Koreas remain technically at war with the presence of nearly two million troops at the border.
North Korea imposed one of the world's most stringent lockdowns four years ago.
This comes as North Korea tries to come up with solutions to its declining birth rate.
Seoul's spy agency has claimed that Pyongyang may have received support from Russia.
There has been a significant increase in rail traffic between Russia and North Korea.
The 23-year-old private crossed into North Korean territory from South Korea on July 18.
King Charles II congratulated the Kim Dynasty on its 75th anniversary, while Kim Jong-un made his way to Russia to join arms deal discussions with Putin.
North Korean dictator Kim Jung Un has arrived in Russia for a meeting with President Vladimir Putin.
North Korean leader Kim Jong Un has accused the United States and its allies of turning the waters off the Korean Peninsula into "the most unstable waters."
Travis King, the US soldier who crossed into North Korea last month, wanted refuge from "inhuman maltreatment and racial discrimination within the US Army,"
North Korean dictator Kim Jong Un has ordered a drastic increase in weapons production.
North Korean dictator Kim Jong Un asked his generals to prepare for the possibility of war.
The United States government has refused to classify its soldier Travis King as a prisoner of war (PoW) after he crossed into North Korea last month.
A US Army soldier reportedly crossed the demarcation line into North Korea on Tuesday and is said to be in the custody of North Korean authorities.
Economic slowdown, border restrictions and Covid-19 have created a shortage of food in North Korea
South Korea's military said it had "detected one ballistic missile with a medium range or longer fired from the Pyongyang area at 0723 (1023 GMT)".
Former US President Donald Trump is no stranger to controversies. He has often made headlines for his remarks and stance on issues.
The United States, China and Russia argued during a United Nations Security Council meeting on Monday over who was to blame for spurring North Korea's dozens of ballistic missile launches and development of a nuclear weapons program.
The most significant joint military drills between the U.S. and South Korea have been held in the past five years coincide with Pyongyang's most recent tests.
The hostility between Japan and South Korea dates back to the former's colonial rule over the Korean Peninsula a century ago.
The unnamed agent risks being executed by North Korea's firing squad for reading about the dictator from within Bureau 10.