1. Portcullis Gate and the Argyle Tower
Pass through a gateway built almost 450 years ago following the devastation wrought by the Lang Siege. Look up to see a spiked portcullis, raised today to let visitors inside but once lowered to keep enemies out. The upper floor, reached by the Lang Stairs, dates to 1887. Inside are cannon balls from the Lang Siege and an iron helmet from Oliver Cromwell's occupation of the Castle.
2. Lang Stairs
Take the direct route to the summit of the Castle Rock, up a great flight of steps that once constituted the original entrance under the Constable's Tower, destroyed in 1573. You could take a gentler alternative route around the cobbled hill, built to ease the movement of heavy guns.
3. Dog Cemetery
Look for the names of the beloved pets of British Army officers and regimental mascots, who have been buried here since the 1840s. Some of these animals travelled the globe to accompany their military masters on campaign.
4. Mons Meg
Stare down the barrel of this celebrated siege gun and imagine the power it once unleashed. Given to King James II in 1457, Mons Meg could fire gunstones weighing 150kg for up to 3.2km (two miles) - one was fired over the city in honour of the marriage of Mary Queen of Scots.
5. Half Moon and Forewall batteries
Look out over the Old Town from the top of the Half Moon Battery that gives the Castle its distinct profile. This great structure was built around the ruins of the medieval David's Tower, destroyed in the Lang Siege of 1573. The Forewall Battery was built in the 1540s on the line of the castle's medieval defences. The Fore Well, almost 34m deep, was the castle's main water supply from the early 1300s.
6. David's Tower
Descend beneath the Half Moon Battery to a temporary barracks built in the wake of the Lang Siege of 1573 over the ruined remnants of the once colossal David's Tower. The tower was built in the 1370s and blown to pieces in that destructive siege, 200 years later.
7. Great Hall
This magnificent hall was completed in 1511 for the state ceremonies of King James IV. You can still see the original hammerbeam roof. There is a remarkable collections of weapons and armour around the walls, including many different pole arms and even Georgian mortars.
8. Scottish National War Memorial
Reflect on the sacrifice made by those who fell in the First and Second World Wars and subsequent military campaigns. This remarkable memorial was opened in 1927, drawing on the talents of some of Scotland's finest artists and craftsmen and women.
9. Prisons of War exhibition
Explore the vaults under the Great Hall where prisoners of war and pirates were held in the 18th and 19th centuries. Learn about the sailors who were incarcerated here, including many Americans and a five-year-old French drummer boy captured at the Battle of Trafalgar.
10. Military Prisons
This miniature version of a Victorian prison was reserved for offending soldiers. Inmates were kept in solitary confinement and compelled to do hard punishment such as working a treadmill for hours on end for offences such as being 'drunk on guard'.
11. Royal Scots Museum
Explore the heritage of the Royal Scots, formerly the oldest serving regiment in the British Army and known as 'Pontius Pilate's Bodyguard'. In this independent regimental museum there are stories from more than 350 years of campaigning, including the heroics behind the six Victoria Crosses on display.
12. Royal Scots Dragoon Guards Museum
Discover more about the history of the Royal Scots Dragoon Guards, the senior Scottish regiment in the British Army in this independent regimental museum. Don't miss the French Eagle and Standard captured at the Battle of Waterloo in an epic cavalry charge.
13. Governor's House and New Barracks
The Georgian lodgings built in 1742 for the castle's Governor are still used for their original purpose. The Ordnance Survey, the organisation that maps the country, may have had its genesis in the house's basement. The nearby New Barracks were built during the Napoleonic Wars with France. The military continues to use both buildings and hence they are off limits to visitors.
14. National War Museum
Learn more about Scotland's proud military history through an outstanding collection. Look out for iconic paintings like The Thin Red Line, military kilts and bagpipes and modern-day weaponry - and don't forget to say hello to Bob the dog.
15. Argyle Battery
Stand on a six-gun battery, built in the 1730s and see where our guns are pointing. The views over the city towards Fife are spectacular. The cannons here were made in about 1810, at the time of the Napoleonic Wars with France.