On our small island of a little more than 700 sq km, many Singaporeans' sense of adventure and discovery seem confined to the known, the familiar and comfortable.

Physical spaces of everyday urban life, such as shopping malls, high-rise buildings, roads and offices, all reinforce this.

As an island city-state, Singapore is a small and dense nation where most of the population live, work and play in an urban environment.

However, there is more than meets the eye in this global metropolis that we call home.

The Little Red Dot is also known as the Garden City - one of the greenest cities in the world - due, in part, to policies that support tree planting.

To celebrate the nation's upcoming 51st birthday, The Straits Times' photojournalists uncover some hidden treasures in our own backyard which you will not find in a regular tourist itinerary.

From a 2km trek to seven huge water pipes, to the crumbling remains of a building in the southern end of the country, they capture a part of Singapore and a slice of our past which have escaped the tear-down, build-up ethic that has transformed the rest of the city-state.

In part one of our two-part Guess Where Singapore series, have some fun and try to guess where these pockets of greenery and sometimes un-manicured beauty are located.

The answers are found at the bottom right corner of the facing page.

In part two next Thursday, our photographers will share their takes on unconventional places in urban Singapore.

To experience 360-degree panoramic photographs of the respective locations, visit http://str.sg/guesswhere