'Number 10' in London and St. Peter's Basilica in Vatican City are just a few of the world's famous ancient doors that are a must-see.
The Prime Minister's house, located at historic 'Number 10' in London, is identified by a glossed black door with a lion's head knocker in the Georgian style.
After being forced to close in the wake of the Great Chicago Fire in 1871, the Palmer House in Chicago has been proud of its bronze peacock doors since its reopening in 1873.
The Holy Door, or "Porta Sancta," of St. Peter's Basilica is only accessible during a Holy Year (Jubilee), which happens once every 25 years.
According to Architectural Digest, Ueno Toshogu Shrine in Tokyo, Japan has protected the Shinto-style destination since 1651.
Christopher Columbus's life is chronicled in the magnificent Columbus doors that stand in the rotunda of the US Capitol Building in Washington, DC.
It is said that the doors of Durin in J.R.R. Tolkien's "The Fellowship of the Ring" were modelled after the enchanted entry of St. Edward's Church in Gloucestershire, England.
In Fez, Morocco, the King of Morocco's Palace is located behind a set of imposing brass doors decorated with stars and featuring cedar and zellige embellishments.
Gothic and Moorish elements can be seen in the Puerta del Perdon, or "Doors of Forgiveness," which have adorned the Cordoba, Spain, mosque-cathedral since 1337.