The Olympic Stadium (Dutch: Olympisch Stadion) was built as the main stadium for the 1928 Summer Olympics in Amsterdam. The first event at the stadium was the start of the 1928 Olympic hockey tournament on 17 May 1928.[2] When completed, the stadium had a capacity of 31,600. Following the completion of the rival De Kuip stadium in Rotterdam in 1937, the Amsterdam authorities increased the capacity of the Olympic Stadium to 64,000 by adding a second ring to the stadium. AFC Ajax used the Olympic Stadium for international games until 1996, when the Amsterdam Arena was completed. In 1987 the stadium was listed as a national monument. Renovation started in 1996, and the stadium was refurbished into the original construction of 1928. The second ring of 1937 was removed, reducing capacity to 22,288, and the stadium was made suitable for track and field competitions again.

The Omniversum in the Hague is Europe’s first 360° IMAX-cinema.

The Oosterschelde (Eastern Scheldt) is an estuary in Zeeland, Netherlands, between Schouwen-Duiveland and Tholen on the north and Noord-Beveland and Zuid-Beveland on the south. Is is also the largest national park in the Netherlands, founded in 2002.

The Openbare Bibliotheek Amsterdam (Public Library Amsterdam) is a collective name for all public libraries in Amsterdam, Netherlands. The first library opened in 1919 at the Keizersgracht. As of 2007, there are 28 public libraries and 43 lending points, such as in hospitals. In 2005, OBA had 1.7 million books and 165,000 members and lent out 5 million books.

The Openbare Bibliotheek Amsterdam (Public Library Amsterdam) is a collective name for all public libraries in Amsterdam, Netherlands. The first library opened in 1919 at the Keizersgracht. As of 2007, there are 28 public libraries and 43 lending points, such as in hospitals. In 2005, OBA had 1.7 million books and 165,000 members and lent out 5 million books.The largest of these libraries, the Centrale Bibliotheek, moved to the Prinsengracht in 1977 and 30 years later, on 7 July 2007 (070707), to the Oosterdokseiland, just east of Amsterdam Centraal station. It is the largest public library in Europe. The complex has a floor surface of 28,500 m2, spread out over 10 floors, 1200 seats, of which 600 with Internet-connected computers and a staff of 200. Also included are an auditorium, an exhibition room, the Library Museum, the Gerard Reve Museum and 2000 parking spaces for bicycles. On the seventh floor is a V&D La Place self-service restaurant with a south-facing terrace. The cost of the project was €80 million. The building was designed by Jo Coenen, the former state architect (Rijksbouwmeester) of the Netherlands, who also designed the nearby KNSM Island, as well as the Central Library of Maastricht, and renovated the distinctive Glaspaleis in Heerlen, which houses its Central Library. The Central Library is open 7 days per week from 10 a.m. to 10 p.m. and the lending and returning of books is fully automated.

Operation Market Garden (17–25 September 1944) was an unsuccessful Allied military operation, fought in the Netherlands and Germany in the Second World War. It was the largest airborne operation up to that time.[e] Field Marshal Montgomery's goal was to force an entry into Germany and over the Rhine. He wanted to circumvent the northern end of the Siegfried Line and this required the operation to seize the bridges across the Maas (Meuse River) and two arms of the Rhine (the Waal and the Lower Rhine) as well as several smaller canals and tributaries. Crossing the Lower Rhine would allow the Allies to encircle Germany's industrial heartland in the Ruhr from the north. It made large-scale use of airborne forces, whose tactical objectives were to secure the bridges and allow a rapid advance by armored units into Northern Germany.

The 800 year old Oude Kerk ("old church") is Amsterdam’s oldest building and oldest parish church, founded ca. 1213 and finally consecrated in 1306 by the bishop of Utrecht with Saint Nicolas as its patron saint. After the Reformation in 1578 it became a Calvinist church, which it remains today. It stands in De Wallen, now Amsterdam's main red-light district. The square surrounding the church is the Oudekerksplein.

The contactless smart card OV-Chipkaart (OV-Chipcard) can be used on all forms of public transport (OV stands for Openbaar Vervoer meaning Public Transport). OV-chipkaart types and obtaining a card The OV-chipkaart comes in three versions: Disposable OV-chipkaart sold with a travel product that cannot be recharged or reloaded with another product. It does not contain an electronic purse and is meant for people who rarely use public transport in the Netherlands. They are available for a range of fares, such as a three-day pass to all public transport in one city. The single-trip variants are sold on the bus by the driver, and sometimes on the tram. Anonymous OV-chipkaart available for €7.50 at ticket offices and vending machines valid up till 5 years. This card is reusable and has an electronic purse. It is transferable, and therefore cannot be used for discounted travel, or for monthly or annual season tickets. However, the anonymous card can contain multiple products simultaneously, as long as those are 'simple' travel products, like those available for the disposable card. Personal OV-chipkaart is useful for anyone entitled to travel with a discount. It is also the only type that can hold a monthly or annual season ticket. Because of these characteristics, the personal card is non-transferable and features the holder's photograph and date of birth. The personal OV-chipkaart has an electronic purse. In addition, it can be set to automatically top its balance up when it drops below a certain level. The personal card is the only one that can be blocked if it is lost or stolen.